CA1052144A - Connection between core and armatures of structures comprising a core of agglomerated fibres - Google Patents
Connection between core and armatures of structures comprising a core of agglomerated fibresInfo
- Publication number
- CA1052144A CA1052144A CA270,774A CA270774A CA1052144A CA 1052144 A CA1052144 A CA 1052144A CA 270774 A CA270774 A CA 270774A CA 1052144 A CA1052144 A CA 1052144A
- Authority
- CA
- Canada
- Prior art keywords
- rod
- wedge element
- sleeve
- fitting
- anchoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
- H01B17/40—Cementless fittings
Landscapes
- Insulators (AREA)
- Electron Sources, Ion Sources (AREA)
- Insulating Bodies (AREA)
- Processing Of Terminals (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Moulding By Coating Moulds (AREA)
- Gasket Seals (AREA)
Abstract
METHOD OF PRODUCING A ROD ANCHORING STRUCTURE
ABSTRACT OF THE DISCLOSURE
Method of producing a rod anchoring structure particularly for use in high tension insulators. It comprises an assemb-ly of a rod in an anchoring fixing. The end of the rod is fitted with a surrounding double ended wedge element having a neck and flaring in both directions along the rod away from the neck. This wedge element is then jammed in the anchoring fixing, either by deforming a sleeve tightly around the wedge element or by winding a filament tightly around it.
ABSTRACT OF THE DISCLOSURE
Method of producing a rod anchoring structure particularly for use in high tension insulators. It comprises an assemb-ly of a rod in an anchoring fixing. The end of the rod is fitted with a surrounding double ended wedge element having a neck and flaring in both directions along the rod away from the neck. This wedge element is then jammed in the anchoring fixing, either by deforming a sleeve tightly around the wedge element or by winding a filament tightly around it.
Description
~s~
The present invention relates to an anchorin~ structure and to a method of producing one.
Such structures are particularly intended for use in, , insulators such as pylon stays as described in the parent application.
A difficulty occurs in the method of manufacture ' described in the parent application in relation to a wed~e `, element which is moulded betwee~ an anchorin~ fittin~ in -~
the form of a sleeve and a rod received therein. The wedge `
element is ~ormed after the rod is received in the sleeve by pourin~ a substance such as resin into the ~ap between the rod and the sleeve and allowin~ the substance to set.
Under such circumstances it is dirficult to,check that the wed~,e element is homo~,eneous and that it fills the Fap ' entirely without leavin~ any spaces or air bubbles. Such . spaces reduce the mechanical stren~th and also reduces the maximum voltage the anchorin~ structure can withstand. This ~ , ;,~' is of importance in the hi~h tension applications envisa~ed.
The~present invention miti~ates thls drawback by , 20 providin~ a method which simplifies verification Or the ~Jedge ;~ ' ' element. '' ' The present invention provides a method of producin~
,a rod anchoring structure comprisin~ the steps of ~ittin8 ' the end oP 2 rod with a surroundin~ double-ended wed~e ,, ' element havin~ a neck from whi~h flared ends Of increasin~ ' '~ cross-sectional area extend in both axial directions alon~ ' ~ the rod and of so fittin~ the wed~e element in an anchorin~
`' rittin~ that the wed~e element is radially compressed by the ¦ anchorin~ fitting even ~n the absence Or an axial load on ~-3~ the rod.
:
i~
.. . ..
,~ ,n~o~
- Prefsrably the anchorin~ rittin~ ha~ ~n initial shape o~ an open-ended tubular sleeve in which the wed~e-bearing end Or the rod is received and which is subsequently de-rormed into an open-ended nozzle-shaped sleeve pressin~
tightly aainst the wed~e element.
` Alternatively the anchorin~ fitting is formed by ,~, winding a ~ilament of suitable ~aterial such as metal wire or resin-impre~nated or~anic fib're around the wed~e element.
~he wed~e element may have an axial pretensionin~
~0 applied thereto durin~ the fittin of the anchorin~ fittin~
The wedee element may be made, of resin which is ' ,~' ~, preferably moulded onto the end Or the rod in a mould for ~,1 ' producing the desired shape to avoid subsequent machining r trimming. Advanta~eously the rod is made of resin ~ a~,glomerated ~ibres and the wed~e e;ement is moulded onto ~
'~, the rod be~ore the resin of the rod has completely poly- ~ -.~ , .. - ~: .
'j merized, thereby improving adhesion between the rcd and '~
'i~ th~ wede element. `~;
~i ~he present invention aIso provides a rod anchorin~
'~ 20 8tructure produced by the method.
' , Embodiments of a rod anchorinE str~cture embodyin~
the present invention are described by way of example with ', reference to the accompanyin drawin~ in which~
j Figure 1 shows a rod with a wed~e element thereon;
,~ Figure 2 shows ~ sleeYeanchorin~ fitting receivin~ ~, the wad~e element and before being pressed onto it; ;'~
~ ure 3 shows the fittin~ of figure 2 after bein~ 1 ', pres~ed onto the wed~e element;
ure 4 shows a fittin~ analo~ous to the one of ;, ~' ' - :
.
~05~
fi~ure 3, also comprising a hoop or strappin~ around the ; middle part o~ the sleeve, and Fi~ure 5 shows a ~ittin~ analo~ous to the one o~
~i~ure 3, also comprisin~ a thin sleeve o~ soft ductile metal between the wed~e element and the sleeve.
In ~igure l, a rod l made o~ res~n-a~lomerated ~lass fibres is embedded at one end in a wedge element 2 o~ resin ~ which is full o~ an a~re~ate such as grains of silica - an~or fibres and which has a double truncated~cone or "diabolo" shape. The wede element 2 is moulded onto the - end of the rod l in a two part mould (not shown). After polymerization of the resin the mould is opened and ~he rod 1 to~ether with its ~itted wed~e element 2 are removed, which makes it easy to veri~y the condition Or the resin o~ the wed~e element 2. To ensure a better connection . between the rod l and the resin wedge element 2, it is ~, . . .
-r possible to start with an incomplete polymerization of the resin of the rod l be~ore the mouldin~ of the wedge element ~ thereto, and then allow the polymerization to rinish after ~he ~oulding of the a~gre~ated resin.
An anchoring fitting is then applied to the wedge element 2 in order to complete the anchorin~ of the end of the rod l. The initial shape of this fitting is shown in ;i figure 2. It comprises 2 cylindrical sleeve 4 which is open at one end and closed at the other end by an end portion 3 , . :
, which includes an eye for fixin~ the rod to a support. The ~ ~ <
;j bo~e diameter of the sleeve 4 is sli~htly greater than the -maximum diameters of the wedge element 2. The wedge element 2 `"''! ' ~S inserted into the slee~e 4 which is then deformed around r.
~3~ ~ ~
`. ' ' ' , ;. ~, .. ' .` , .
:....... ,, . ~ ~ - : . .
: ~Lo~44 : -;~ the neck of the wed~e element 2 to become a tight rit. The deformation may be by for~ine, by a cold working method such as rollin~ or, when a relatively thin sleeve of , ductile metal such as aluminium is used, by isostatic pressin~ inside 2 pressurized elastomeric casin~ or by magnetic crimpine. The anchoring element shown in ~i~ure is thus obtained, If greater stren~th is required ~or the anchoring ~itting, the sleeve 4 may be made of steel (or any other metal havin~ high mechanical stren~th) and should be pressed aeainst the wed~e element 2 in the re~,ion of the neck and ~`~ then (or preferably simultaneously) on either side thereof.
The mechanical ætren~th of the anchoring ritting can be ~urther reinforced by strappin~ the deformed sleeve `~
~igure 4j. The deformed sleeve can be strapped in the usual way by windin~ a metal wire round it or even by casting an exterior sleeve 5 made of an alloy havin~ a `~
moderate meltin~ po~nt~ such as an alumin;um alloy, To be more certain of preYenting any inclusion of air ?
between the wed~e element 2 and the bore of the sleeve 4 ~ it is advanta~,eous to cover the preformed resin wed~e - element 2 with a protective layer 5 made of a soft ductile metal such as aluminium.
; One advantage of pressing the sleeve 4 onto the resin `
; wedge element 2 i9 that the progressive deformation of the ~;~ sleeve 4 on either side of the neck can be made to provoke a condition of permanent tensile stress with its re~ultant in the axial direction b~tween the wedge element 2 and the ~leeve 4. This stress contributes to pressin~ the two conical .
'', ' , ' ' : . , -.- ~, . - .
~ , - , .. . ~ . , .. . , . " - ., ~5~
parts o~ the wed~e element 2 a~ainst the nozzle-shaped bore of the sleeve 4. When the rod 1 is subsequently subjected to lon~itudin~l traction, there is no displacement Or the wedge element 2 in relation to the nozzle for as lon~ as khere remain c~mpression stresses at the wed~e-nozzle inter~ace on the side on which the traction is applied (i.e. on the side which is pro~ressively releaved o~ stress ~;
by the applied traction). This effect can ~urther be accentuated by subjecting the rod 1 and consequently the resin wed~e element 2 to a traction during the ~orming of the sleeve 4 about the wed~e element 2. For this purpose ~ .
~t is advantageous firstly to press the part or the sleeve 4 which is closest to the end o~ the rod 1, up to the neck then to apply traction to the rod 1 rrom its opposite end and then to continue the pressin~ o~ the sleeve 4 over the other half Or the wedge element 2.
Althou~h the variants of embodiment of the improved structure, as well as their manu~acturin~ methods, which have just been described, appear pre~erable, it will be . - . .
. 20 understood that various modifications can be made thereto without ~oin~ beyond the scope of the invention, it being possible to repla~e some elements or some operations by ... others w~ich would still fall within the scope of the claims.
In particular the anchorin~ fitting could be formed by . :~; . .
` . winding a filament or thread of suitable material around the ~ ~
. wed~e element 2. The filament should be ti~htly bound to ~ -provide the required compressive stress in the wedge.element.
. Suitable materials include metal wires or ropes and resin : bounded fibres.......... , . ;~ :
~ i:
.. . . - . :~ :.
. .
5~
,'. '' :
.: ~ .. . . .
The present invention relates to an anchorin~ structure and to a method of producing one.
Such structures are particularly intended for use in, , insulators such as pylon stays as described in the parent application.
A difficulty occurs in the method of manufacture ' described in the parent application in relation to a wed~e `, element which is moulded betwee~ an anchorin~ fittin~ in -~
the form of a sleeve and a rod received therein. The wedge `
element is ~ormed after the rod is received in the sleeve by pourin~ a substance such as resin into the ~ap between the rod and the sleeve and allowin~ the substance to set.
Under such circumstances it is dirficult to,check that the wed~,e element is homo~,eneous and that it fills the Fap ' entirely without leavin~ any spaces or air bubbles. Such . spaces reduce the mechanical stren~th and also reduces the maximum voltage the anchorin~ structure can withstand. This ~ , ;,~' is of importance in the hi~h tension applications envisa~ed.
The~present invention miti~ates thls drawback by , 20 providin~ a method which simplifies verification Or the ~Jedge ;~ ' ' element. '' ' The present invention provides a method of producin~
,a rod anchoring structure comprisin~ the steps of ~ittin8 ' the end oP 2 rod with a surroundin~ double-ended wed~e ,, ' element havin~ a neck from whi~h flared ends Of increasin~ ' '~ cross-sectional area extend in both axial directions alon~ ' ~ the rod and of so fittin~ the wed~e element in an anchorin~
`' rittin~ that the wed~e element is radially compressed by the ¦ anchorin~ fitting even ~n the absence Or an axial load on ~-3~ the rod.
:
i~
.. . ..
,~ ,n~o~
- Prefsrably the anchorin~ rittin~ ha~ ~n initial shape o~ an open-ended tubular sleeve in which the wed~e-bearing end Or the rod is received and which is subsequently de-rormed into an open-ended nozzle-shaped sleeve pressin~
tightly aainst the wed~e element.
` Alternatively the anchorin~ fitting is formed by ,~, winding a ~ilament of suitable ~aterial such as metal wire or resin-impre~nated or~anic fib're around the wed~e element.
~he wed~e element may have an axial pretensionin~
~0 applied thereto durin~ the fittin of the anchorin~ fittin~
The wedee element may be made, of resin which is ' ,~' ~, preferably moulded onto the end Or the rod in a mould for ~,1 ' producing the desired shape to avoid subsequent machining r trimming. Advanta~eously the rod is made of resin ~ a~,glomerated ~ibres and the wed~e e;ement is moulded onto ~
'~, the rod be~ore the resin of the rod has completely poly- ~ -.~ , .. - ~: .
'j merized, thereby improving adhesion between the rcd and '~
'i~ th~ wede element. `~;
~i ~he present invention aIso provides a rod anchorin~
'~ 20 8tructure produced by the method.
' , Embodiments of a rod anchorinE str~cture embodyin~
the present invention are described by way of example with ', reference to the accompanyin drawin~ in which~
j Figure 1 shows a rod with a wed~e element thereon;
,~ Figure 2 shows ~ sleeYeanchorin~ fitting receivin~ ~, the wad~e element and before being pressed onto it; ;'~
~ ure 3 shows the fittin~ of figure 2 after bein~ 1 ', pres~ed onto the wed~e element;
ure 4 shows a fittin~ analo~ous to the one of ;, ~' ' - :
.
~05~
fi~ure 3, also comprising a hoop or strappin~ around the ; middle part o~ the sleeve, and Fi~ure 5 shows a ~ittin~ analo~ous to the one o~
~i~ure 3, also comprisin~ a thin sleeve o~ soft ductile metal between the wed~e element and the sleeve.
In ~igure l, a rod l made o~ res~n-a~lomerated ~lass fibres is embedded at one end in a wedge element 2 o~ resin ~ which is full o~ an a~re~ate such as grains of silica - an~or fibres and which has a double truncated~cone or "diabolo" shape. The wede element 2 is moulded onto the - end of the rod l in a two part mould (not shown). After polymerization of the resin the mould is opened and ~he rod 1 to~ether with its ~itted wed~e element 2 are removed, which makes it easy to veri~y the condition Or the resin o~ the wed~e element 2. To ensure a better connection . between the rod l and the resin wedge element 2, it is ~, . . .
-r possible to start with an incomplete polymerization of the resin of the rod l be~ore the mouldin~ of the wedge element ~ thereto, and then allow the polymerization to rinish after ~he ~oulding of the a~gre~ated resin.
An anchoring fitting is then applied to the wedge element 2 in order to complete the anchorin~ of the end of the rod l. The initial shape of this fitting is shown in ;i figure 2. It comprises 2 cylindrical sleeve 4 which is open at one end and closed at the other end by an end portion 3 , . :
, which includes an eye for fixin~ the rod to a support. The ~ ~ <
;j bo~e diameter of the sleeve 4 is sli~htly greater than the -maximum diameters of the wedge element 2. The wedge element 2 `"''! ' ~S inserted into the slee~e 4 which is then deformed around r.
~3~ ~ ~
`. ' ' ' , ;. ~, .. ' .` , .
:....... ,, . ~ ~ - : . .
: ~Lo~44 : -;~ the neck of the wed~e element 2 to become a tight rit. The deformation may be by for~ine, by a cold working method such as rollin~ or, when a relatively thin sleeve of , ductile metal such as aluminium is used, by isostatic pressin~ inside 2 pressurized elastomeric casin~ or by magnetic crimpine. The anchoring element shown in ~i~ure is thus obtained, If greater stren~th is required ~or the anchoring ~itting, the sleeve 4 may be made of steel (or any other metal havin~ high mechanical stren~th) and should be pressed aeainst the wed~e element 2 in the re~,ion of the neck and ~`~ then (or preferably simultaneously) on either side thereof.
The mechanical ætren~th of the anchoring ritting can be ~urther reinforced by strappin~ the deformed sleeve `~
~igure 4j. The deformed sleeve can be strapped in the usual way by windin~ a metal wire round it or even by casting an exterior sleeve 5 made of an alloy havin~ a `~
moderate meltin~ po~nt~ such as an alumin;um alloy, To be more certain of preYenting any inclusion of air ?
between the wed~e element 2 and the bore of the sleeve 4 ~ it is advanta~,eous to cover the preformed resin wed~e - element 2 with a protective layer 5 made of a soft ductile metal such as aluminium.
; One advantage of pressing the sleeve 4 onto the resin `
; wedge element 2 i9 that the progressive deformation of the ~;~ sleeve 4 on either side of the neck can be made to provoke a condition of permanent tensile stress with its re~ultant in the axial direction b~tween the wedge element 2 and the ~leeve 4. This stress contributes to pressin~ the two conical .
'', ' , ' ' : . , -.- ~, . - .
~ , - , .. . ~ . , .. . , . " - ., ~5~
parts o~ the wed~e element 2 a~ainst the nozzle-shaped bore of the sleeve 4. When the rod 1 is subsequently subjected to lon~itudin~l traction, there is no displacement Or the wedge element 2 in relation to the nozzle for as lon~ as khere remain c~mpression stresses at the wed~e-nozzle inter~ace on the side on which the traction is applied (i.e. on the side which is pro~ressively releaved o~ stress ~;
by the applied traction). This effect can ~urther be accentuated by subjecting the rod 1 and consequently the resin wed~e element 2 to a traction during the ~orming of the sleeve 4 about the wed~e element 2. For this purpose ~ .
~t is advantageous firstly to press the part or the sleeve 4 which is closest to the end o~ the rod 1, up to the neck then to apply traction to the rod 1 rrom its opposite end and then to continue the pressin~ o~ the sleeve 4 over the other half Or the wedge element 2.
Althou~h the variants of embodiment of the improved structure, as well as their manu~acturin~ methods, which have just been described, appear pre~erable, it will be . - . .
. 20 understood that various modifications can be made thereto without ~oin~ beyond the scope of the invention, it being possible to repla~e some elements or some operations by ... others w~ich would still fall within the scope of the claims.
In particular the anchorin~ fitting could be formed by . :~; . .
` . winding a filament or thread of suitable material around the ~ ~
. wed~e element 2. The filament should be ti~htly bound to ~ -provide the required compressive stress in the wedge.element.
. Suitable materials include metal wires or ropes and resin : bounded fibres.......... , . ;~ :
~ i:
.. . . - . :~ :.
. .
5~
,'. '' :
.: ~ .. . . .
Claims (22)
1/ A method of producing a rod anchoring structure comprising the steps of fitting the end of a rod with a surrounding, double-ended wedge element having a neck from which flared ends of increasing cross-sectional area extend in both axial directions along the rod and of so fitting the wedge element in an anchoring fitting that the wedge element is radially compressed by the anchoring fitting even in the absence of an axial load on the rod.
2/ A method according to claim 1, wherein the anchoring fitting has an initial shape of an open-ended tubular sleeve in which the wedge-bearing end of the rod is received and which is subsequently deformed into an open-ended nozzle-shaped sleeve pressing tightly against the wedge element.
3/ A method according to claim 2, whereir the sleeve is of ductile metal and is sufficiently thin to be pressed onto the wedge element by isostatic pressing.
4/ A method according to claim 2; wherein the sleeve is of ductile metal and is sufficiently thin to be pressed onto the wedge element by magnetic crimping.
5/ A method according to claim 2; wherein the sleeve is of a metal of high mechanical strength and is pressed onto the wedge element by cold working.
6. A method according to claim 2, wherein the sleeve is of a metal of high mechanical strength and is pressed onto the wedge element by forging.
7. A method according to claim 5 or 6, wherein the wedge element is covered with a layer of soft metal before having the sleeve pressed onto it.
8. A method according to claim 2, wherein the sleeve is strapped at least in the vicinity of the neck after fitting to the wedge element.
9. A method according to claim 8, wherein the sleeve is made of metal and is strapped by moulding an exterior sleeve in a metal of lower melting point than the sleeve.
10. A method according to claim 8, wherein the strapping is by winding a metal wire around the sleeve.
11. A method according to claim 1, wherein the anchoring fitting is formed by winding a filament around the wedge element.
12. A method according to claim 11, wherein the filament is a metal wire.
13. A method according to claim 11, wherein the filament is a resin-impregnated organic fibre.
14. A method according to claim 2, wherein the anchoring fitting is initially fitted around the neck of the wedge element and is subsequently fitted against the rest of it.
15. A method according to claim 14, wherein the fitting of the anchoring fitting onto the wedge element moves progressive-ly away from the neck on either side thereof.
16. A method according to claim 2, wherein an axial force is applied to the rod during fitting of the anchoring fitting to provide a degree of axial pre-tensioning between the two halves of the wedge element and the anchoring fitting.
17. A method according to claim 16, wherein the anchoring fitting is initially fitted tightly to the half of the wedge element which is nearest to the end of the rod, the rod is then subjected to traction away from the fitted end and the other an-choring fitting is tightened around the other half of the wedge element while the rod is subjected to the traction.
18. A method according to claims 1, 2 or 3, wherein the rod is made of agglomerated fibres.
19. A method according to claim 1, wherein the wedge ele-ment is made of resin.
20. A method according to claim 19, wherein the resin is moulded onto the rod in a mould cavity having the shape of the wedge element.
21. A method according to claim 20, wherein the rod is made of resin-agglomerated fibres and the wedge element is moulded onto the rod before the resin of the rod has completely polymerized.
22. A rod anchoring structure produced according to the method of claims 1, 2 or 3.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7603973A FR2345796A2 (en) | 1976-02-13 | 1976-02-13 | IMPROVEMENT IN THE BOND BETWEEN CORE AND REINFORCEMENTS OF STRUCTURES CONTAINING A CORE OF AGGLOMERATED FIBERS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1052144A true CA1052144A (en) | 1979-04-10 |
Family
ID=9169079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA270,774A Expired CA1052144A (en) | 1976-02-13 | 1977-01-28 | Connection between core and armatures of structures comprising a core of agglomerated fibres |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5341670A (en) |
| BR (1) | BR7700786A (en) |
| CA (1) | CA1052144A (en) |
| DE (1) | DE2704987A1 (en) |
| ES (1) | ES455715A2 (en) |
| FR (1) | FR2345796A2 (en) |
| GB (1) | GB1567386A (en) |
| IT (1) | IT1079585B (en) |
| NO (1) | NO143474C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054730B2 (en) * | 1978-03-02 | 1985-12-02 | 日本碍子株式会社 | Synthetic resin insulator |
| FR2445596A2 (en) * | 1978-12-27 | 1980-07-25 | Ceraver | IMPROVEMENT IN THE LINK BETWEEN CORE AND STRUCTURES OF STRUCTURES COMPRISING A CORE OF AGGLOMERATED FIBERS |
| FR2514546A1 (en) * | 1981-06-30 | 1983-04-15 | Ceraver | METHOD FOR REALIZING A CONNECTION BETWEEN A JONC AND A METALLIC FRAME IN A COMPOSITE INSULATOR AND COMPOSITE INSULATOR OBTAINED BY THIS METHOD |
| NO154939C (en) * | 1984-08-31 | 1987-01-14 | Hoeiness & Hoeiness | ANCHORING DEVICE FOR A PIPE IN AN ENDFEST. |
-
1976
- 1976-02-13 FR FR7603973A patent/FR2345796A2/en active Pending
-
1977
- 1977-01-27 GB GB3430/77A patent/GB1567386A/en not_active Expired
- 1977-01-28 CA CA270,774A patent/CA1052144A/en not_active Expired
- 1977-02-07 DE DE19772704987 patent/DE2704987A1/en not_active Withdrawn
- 1977-02-08 ES ES455715A patent/ES455715A2/en not_active Expired
- 1977-02-09 BR BR7700786A patent/BR7700786A/en unknown
- 1977-02-09 JP JP1257777A patent/JPS5341670A/en active Pending
- 1977-02-10 NO NO770442A patent/NO143474C/en unknown
- 1977-02-11 IT IT20229/77A patent/IT1079585B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2345796A2 (en) | 1977-10-21 |
| NO143474C (en) | 1981-02-18 |
| ES455715A2 (en) | 1978-02-16 |
| BR7700786A (en) | 1977-11-08 |
| IT1079585B (en) | 1985-05-13 |
| NO143474B (en) | 1980-11-10 |
| DE2704987A1 (en) | 1977-08-18 |
| JPS5341670A (en) | 1978-04-15 |
| NO770442L (en) | 1977-08-16 |
| GB1567386A (en) | 1980-05-14 |
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