DE822030C - Klopffestmaschende Mischung fuer Motorenbrennstoff - Google Patents
Klopffestmaschende Mischung fuer MotorenbrennstoffInfo
- Publication number
- DE822030C DE822030C DEP42241A DEP0042241A DE822030C DE 822030 C DE822030 C DE 822030C DE P42241 A DEP42241 A DE P42241A DE P0042241 A DEP0042241 A DE P0042241A DE 822030 C DE822030 C DE 822030C
- Authority
- DE
- Germany
- Prior art keywords
- lead
- knock
- mixture according
- bromine
- engine
- 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
- 239000000446 fuel Substances 0.000 title claims description 29
- 239000000203 mixture Substances 0.000 title claims description 27
- 150000002611 lead compounds Chemical class 0.000 claims description 18
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 14
- 229910052794 bromium Inorganic materials 0.000 claims description 14
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 12
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- LUIVNNXFXHFZFD-UHFFFAOYSA-N 1,2-dibromo-3-methylbenzene Chemical compound CC1=CC=CC(Br)=C1Br LUIVNNXFXHFZFD-UHFFFAOYSA-N 0.000 claims description 5
- -1 bromine hydrocarbon Chemical class 0.000 claims description 5
- 125000001246 bromo group Chemical group Br* 0.000 claims description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052753 mercury Inorganic materials 0.000 claims description 5
- RELMFMZEBKVZJC-UHFFFAOYSA-N 1,2,3-trichlorobenzene Chemical compound ClC1=CC=CC(Cl)=C1Cl RELMFMZEBKVZJC-UHFFFAOYSA-N 0.000 claims description 2
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- ZUFOPGXRJSRHQV-UHFFFAOYSA-N [Pb].C=C.C=C.C=C.C=C Chemical compound [Pb].C=C.C=C.C=C.C=C ZUFOPGXRJSRHQV-UHFFFAOYSA-N 0.000 claims 1
- 125000001931 aliphatic group Chemical group 0.000 claims 1
- 150000001348 alkyl chlorides Chemical class 0.000 claims 1
- 125000003118 aryl group Chemical group 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 claims 1
- MRMOZBOQVYRSEM-UHFFFAOYSA-N tetraethyllead Chemical compound CC[Pb](CC)(CC)CC MRMOZBOQVYRSEM-UHFFFAOYSA-N 0.000 description 46
- 239000003599 detergent Substances 0.000 description 37
- 239000012459 cleaning agent Substances 0.000 description 35
- 239000007788 liquid Substances 0.000 description 20
- PAAZPARNPHGIKF-UHFFFAOYSA-N 1,2-dibromoethane Chemical compound BrCCBr PAAZPARNPHGIKF-UHFFFAOYSA-N 0.000 description 16
- 238000009826 distribution Methods 0.000 description 11
- OIRQLILPXCJMIY-UHFFFAOYSA-N 1,2,3-tribromo-2-methylpropane Chemical compound BrCC(Br)(C)CBr OIRQLILPXCJMIY-UHFFFAOYSA-N 0.000 description 8
- FHCLGDLYRUPKAM-UHFFFAOYSA-N 1,2,3-tribromopropane Chemical compound BrCC(Br)CBr FHCLGDLYRUPKAM-UHFFFAOYSA-N 0.000 description 8
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- HKTNRDJXZCCMGH-UHFFFAOYSA-N 1,2,3-tribromobutane Chemical compound CC(Br)C(Br)CBr HKTNRDJXZCCMGH-UHFFFAOYSA-N 0.000 description 7
- 229910052801 chlorine Inorganic materials 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 7
- CBOMUFJAZMWITG-UHFFFAOYSA-N 1,3,4-tribromopentane Chemical compound BrCCC(C(C)Br)Br CBOMUFJAZMWITG-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 229910052736 halogen Inorganic materials 0.000 description 6
- 150000002367 halogens Chemical class 0.000 description 6
- CZNHKZKWKJNOTE-UHFFFAOYSA-N 1,2-dibromocyclohexane Chemical compound BrC1CCCCC1Br CZNHKZKWKJNOTE-UHFFFAOYSA-N 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- VFDYKPARTDCDCU-UHFFFAOYSA-N hexachloropropene Chemical group ClC(Cl)=C(Cl)C(Cl)(Cl)Cl VFDYKPARTDCDCU-UHFFFAOYSA-N 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- UXAFLFGXSIWWMY-UHFFFAOYSA-N 1,3-dibromo-2,2-dimethylpropane Chemical compound BrCC(C)(C)CBr UXAFLFGXSIWWMY-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- VCJZTATVUDMNLU-UHFFFAOYSA-N dibromomethylbenzene Chemical class BrC(Br)C1=CC=CC=C1 VCJZTATVUDMNLU-UHFFFAOYSA-N 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- ULTHEAFYOOPTTB-UHFFFAOYSA-N 1,4-dibromobutane Chemical compound BrCCCCBr ULTHEAFYOOPTTB-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- GZUXJHMPEANEGY-UHFFFAOYSA-N bromomethane Chemical compound BrC GZUXJHMPEANEGY-UHFFFAOYSA-N 0.000 description 2
- 125000001309 chloro group Chemical group Cl* 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- SBGGYHPCGAVESQ-UHFFFAOYSA-N 1,1-dibromo-1-chlorobutane Chemical compound CCCC(Cl)(Br)Br SBGGYHPCGAVESQ-UHFFFAOYSA-N 0.000 description 1
- NWBNUXAQQQVJJI-UHFFFAOYSA-N 1,2,3,4-tetrabromocyclopentane Chemical compound BrC1CC(Br)C(Br)C1Br NWBNUXAQQQVJJI-UHFFFAOYSA-N 0.000 description 1
- OXOSOLAWIOZHMF-UHFFFAOYSA-N 1,2,3-tribromopentane Chemical compound CCC(Br)C(Br)CBr OXOSOLAWIOZHMF-UHFFFAOYSA-N 0.000 description 1
- MKIIBHAVKKVAKM-UHFFFAOYSA-N 1,2-bis(bromomethyl)cyclohexane Chemical compound BrCC1CCCCC1CBr MKIIBHAVKKVAKM-UHFFFAOYSA-N 0.000 description 1
- WQONPSCCEXUXTQ-UHFFFAOYSA-N 1,2-dibromobenzene Chemical compound BrC1=CC=CC=C1Br WQONPSCCEXUXTQ-UHFFFAOYSA-N 0.000 description 1
- CKVJSNYSBIZAAE-UHFFFAOYSA-N 1,2-dibromoheptane Chemical compound CCCCCC(Br)CBr CKVJSNYSBIZAAE-UHFFFAOYSA-N 0.000 description 1
- GZEZIBFVJYNETN-UHFFFAOYSA-N 1,2-dichlorocyclohexane Chemical compound ClC1CCCCC1Cl GZEZIBFVJYNETN-UHFFFAOYSA-N 0.000 description 1
- WBCSJABQCRFUCP-UHFFFAOYSA-N 1,2-dichloroheptane Chemical compound CCCCCC(Cl)CCl WBCSJABQCRFUCP-UHFFFAOYSA-N 0.000 description 1
- VEFLKXRACNJHOV-UHFFFAOYSA-N 1,3-dibromopropane Chemical compound BrCCCBr VEFLKXRACNJHOV-UHFFFAOYSA-N 0.000 description 1
- QMLLRWZQACTYAX-UHFFFAOYSA-N 1,3-dichloropentane Chemical compound CCC(Cl)CCCl QMLLRWZQACTYAX-UHFFFAOYSA-N 0.000 description 1
- IJZUPZAYWWVHIO-UHFFFAOYSA-N 1,4-dichloropentane Chemical compound CC(Cl)CCCCl IJZUPZAYWWVHIO-UHFFFAOYSA-N 0.000 description 1
- LBKDGROORAKTLC-UHFFFAOYSA-N 1,5-dichloropentane Chemical compound ClCCCCCCl LBKDGROORAKTLC-UHFFFAOYSA-N 0.000 description 1
- BXXWFOGWXLJPPA-UHFFFAOYSA-N 2,3-dibromobutane Chemical compound CC(Br)C(C)Br BXXWFOGWXLJPPA-UHFFFAOYSA-N 0.000 description 1
- FUNUTBJJKQIVSY-UHFFFAOYSA-N 2,4-Dichlorotoluene Chemical compound CC1=CC=C(Cl)C=C1Cl FUNUTBJJKQIVSY-UHFFFAOYSA-N 0.000 description 1
- MOUDFOLIRVUWKC-UHFFFAOYSA-N 3,3-dichloropentane Chemical compound CCC(Cl)(Cl)CC MOUDFOLIRVUWKC-UHFFFAOYSA-N 0.000 description 1
- VLRGXXKFHVJQOL-UHFFFAOYSA-N 3-chloropentane-2,4-dione Chemical compound CC(=O)C(Cl)C(C)=O VLRGXXKFHVJQOL-UHFFFAOYSA-N 0.000 description 1
- UXJLBVYYDZDPBV-UHFFFAOYSA-N 5-chloropentylbenzene Chemical compound ClCCCCCC1=CC=CC=C1 UXJLBVYYDZDPBV-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000005997 bromomethyl group Chemical group 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 235000013847 iso-butane Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N sec-butylidene Natural products CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- SMHNCYOTIYFOKL-UHFFFAOYSA-N tetrapropylplumbane Chemical compound CCC[Pb](CCC)(CCC)CCC SMHNCYOTIYFOKL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/103—Liquid carbonaceous fuels containing additives stabilisation of anti-knock agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/30—Organic compounds compounds not mentioned before (complexes)
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/20—Organic compounds containing halogen
- C10L1/201—Organic compounds containing halogen aliphatic bond
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/20—Organic compounds containing halogen
- C10L1/202—Organic compounds containing halogen aromatic bond
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/30—Organic compounds compounds not mentioned before (complexes)
- C10L1/305—Organic compounds compounds not mentioned before (complexes) organo-metallic compounds (containing a metal to carbon bond)
- C10L1/306—Organic compounds compounds not mentioned before (complexes) organo-metallic compounds (containing a metal to carbon bond) organo Pb compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Detergent Compositions (AREA)
- Liquid Carbonaceous Fuels (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US40625A US2479900A (en) | 1948-07-24 | 1948-07-24 | Antiknock mixtures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE822030C true DE822030C (de) | 1951-11-22 |
Family
ID=21912021
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP42241A Expired DE822030C (de) | 1948-07-24 | 1949-05-10 | Klopffestmaschende Mischung fuer Motorenbrennstoff |
| DEP42348A Expired DE843038C (de) | 1948-07-24 | 1949-05-11 | Klopffestmachende Mischung fuer Motorenbrennstoff |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP42348A Expired DE843038C (de) | 1948-07-24 | 1949-05-11 | Klopffestmachende Mischung fuer Motorenbrennstoff |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2479900A (is) |
| BE (2) | BE489214A (is) |
| CH (2) | CH282390A (is) |
| DE (2) | DE822030C (is) |
| FR (1) | FR986121A (is) |
| GB (2) | GB679623A (is) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1005785B (de) * | 1951-08-23 | 1957-04-04 | Bataafsche Petroleum | Treibstoffgemisch |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2591498A (en) * | 1949-04-13 | 1952-04-01 | Standard Oil Dev Co | Process for brominating xylene |
| US2586660A (en) * | 1950-03-01 | 1952-02-19 | Standard Oil Dev Co | Leaded fuel composition |
| BE513665A (is) * | 1951-08-23 | |||
| US2869993A (en) * | 1955-05-31 | 1959-01-20 | Ethyl Corp | Antiknock mixtures |
| US2849302A (en) * | 1955-05-31 | 1958-08-26 | Ethyl Corp | Antiknock compositions |
| US2849303A (en) * | 1955-05-31 | 1958-08-26 | Ethyl Corp | Antiknock compositions |
| US3246965A (en) * | 1958-12-24 | 1966-04-19 | Standard Oil Co | Motor fuel composition containing a halocarbon compound |
| US3085069A (en) * | 1959-01-05 | 1963-04-09 | Du Pont | Process for purifying tetraethyllead compositions |
| DE1167344B (de) * | 1961-03-08 | 1964-04-09 | Du Pont | Verfahren zur Umalkylierung von Bleitetraalkylen |
| US3947257A (en) * | 1974-04-17 | 1976-03-30 | Raychem Corporation | Benzotrifluoride fuel additive for internal combustion engines |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1668022A (en) * | 1925-01-06 | 1928-05-01 | Gen Motors Corp | Motor fuel |
| US2364921A (en) * | 1942-07-06 | 1944-12-12 | Shell Dev | Leaded motor fuels |
| US2447926A (en) * | 1943-07-21 | 1948-08-24 | Sol B Wiczer | Antiknock motor fuel |
-
0
- BE BE489213D patent/BE489213A/xx unknown
- BE BE489214D patent/BE489214A/xx unknown
-
1948
- 1948-07-24 US US40625A patent/US2479900A/en not_active Expired - Lifetime
-
1949
- 1949-04-28 GB GB11304/49A patent/GB679623A/en not_active Expired
- 1949-05-04 GB GB11899/49A patent/GB682385A/en not_active Expired
- 1949-05-10 DE DEP42241A patent/DE822030C/de not_active Expired
- 1949-05-11 DE DEP42348A patent/DE843038C/de not_active Expired
- 1949-05-12 FR FR986121D patent/FR986121A/fr not_active Expired
- 1949-06-03 CH CH282390D patent/CH282390A/fr unknown
- 1949-06-24 CH CH293437D patent/CH293437A/fr unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1005785B (de) * | 1951-08-23 | 1957-04-04 | Bataafsche Petroleum | Treibstoffgemisch |
Also Published As
| Publication number | Publication date |
|---|---|
| FR986121A (fr) | 1951-07-27 |
| DE843038C (de) | 1952-07-03 |
| GB682385A (en) | 1952-11-12 |
| CH282390A (fr) | 1952-04-30 |
| BE489213A (is) | |
| GB679623A (en) | 1952-09-24 |
| US2479900A (en) | 1949-08-23 |
| CH293437A (fr) | 1953-09-30 |
| BE489214A (is) |
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