FR732067A - Perfectionnements relatifs aux circuits d'instruments de téléphones - Google Patents

Perfectionnements relatifs aux circuits d'instruments de téléphones

Info

Publication number: FR732067A
Authority: FR; France
Prior art keywords: improvements relating; telephone instrument; instrument circuits; circuits; telephone
Prior art date: 1931-02-07
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

Application number

Other languages

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Siemens Brothers and Co Ltd

Original Assignee

Siemens Brothers and Co Ltd

Priority date (The priority date 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 date listed.)

1931-02-07

Filing date

1932-02-06

Publication date

1932-09-13

1932-02-06 Application filed by Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd

1932-09-13 Application granted granted Critical

1932-09-13 Publication of FR732067A publication Critical patent/FR732067A/fr

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Details Of Connecting Devices For Male And Female Coupling (AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Charge And Discharge Circuits For Batteries Or The Like (AREA)
Springs (AREA)

FR732067D 1931-02-07 1932-02-06 Perfectionnements relatifs aux circuits d'instruments de téléphones Expired FR732067A (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
GB3949/31A GB372400A (en)	1931-02-07	1931-02-07	Improvements relating to telephone instrument circuits
GB3238/34A GB425566A (en)	1931-02-07	1934-01-31	Improvements in or relating to telephone instrument circuits

Publications (1)

Publication Number	Publication Date
FR732067A true FR732067A (fr)	1932-09-13

Family

ID=32109232

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR732067D Expired FR732067A (fr)	1931-02-07	1932-02-06	Perfectionnements relatifs aux circuits d'instruments de téléphones

Country Status (5)

Country	Link
US (2)	US1919314A (fr)
BE (1)	BE386269A (fr)
FR (1)	FR732067A (fr)
GB (3)	GB372400A (fr)
NL (1)	NL35830C (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2417067A (en) *		1947-03-11		Telephone substation circuit
US2548723A (en) *	1945-07-13	1951-04-10	Kellogg Switchboard & Supply	Telephone set hook-switch apparatus
US2912512A (en) *	1956-06-19	1959-11-10	Gen Telephone Lab Inc	Anti-sidetone and line balancing telephone circuit

1931
- 1931-02-07 GB GB3949/31A patent/GB372400A/en not_active Expired
1932
- 1932-01-28 NL NL60006A patent/NL35830C/xx active
- 1932-01-28 US US589472A patent/US1919314A/en not_active Expired - Lifetime
- 1932-02-06 FR FR732067D patent/FR732067A/fr not_active Expired
- 1932-02-06 BE BE386269D patent/BE386269A/xx unknown
1933
- 1933-01-27 GB GB2661/33A patent/GB407808A/en not_active Expired
1934
- 1934-01-31 GB GB3238/34A patent/GB425566A/en not_active Expired
1935
- 1935-01-11 US US1318A patent/US2099381A/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
US1919314A (en)	1933-07-25
GB425566A (en)	1935-03-18
US2099381A (en)	1937-11-16
GB372400A (en)	1932-05-09
GB407808A (en)	1934-03-29
NL35830C (fr)	1935-07-15
BE386269A (fr)	1932-03-31

Similar Documents

Publication	Publication Date	Title
FR837853A (fr)	1939-02-22	Perfectionnements aux instruments de navigation
FR732067A (fr)	1932-09-13	Perfectionnements relatifs aux circuits d'instruments de téléphones
FR733123A (fr)	1932-09-30	Perfectionnements relatifs aux condenseurs
FR642962A (fr)	1928-09-07	Perfectionnements aux aiguilles d'instruments indicateurs
FR736946A (fr)	1932-12-05	Perfectionnements apportés aux chevalets pour instruments à cordes
FR713944A (fr)	1931-11-04	Perfectionnements aux instruments de labour
FR715733A (fr)	1931-12-08	Instrument de musique
FR751933A (fr)	1933-09-12	Perfectionnements aux instruments de musique
FR535387A (fr)	1922-04-13	Instrument de dessinateur
FR753520A (fr)	1933-10-18	Perfectionnements aux instruments pour écrire
FR40611E (fr)	1932-07-27	Nouvel instrument de musique
FR714170A (fr)	1931-11-09	Instrument de sarclage
FR774967A (fr)	1934-12-17	Instrument de musique
FR553005A (fr)	1923-05-11	Perfectionnements aux instruments d'arpentage
FR737174A (fr)	1932-12-08	Instrument de navigation
FR718109A (fr)	1932-01-19	Instrument dentaire
FR748945A (fr)	1933-07-13	Perfectionnements relatifs aux appareils d'allumage
FR802519A (fr)	1936-09-07	Perfectionnements apportés aux instruments de musique
FR43031E (fr)	1934-01-24	Perfectionnements aux leviers d'itinéraires
FR748944A (fr)	1933-07-13	Perfectionnements aux appareils d'allumage
FR574212A (fr)	1924-07-08	Perfectionnements aux meubles d'étalage réglables
FR725940A (fr)	1932-05-19	Perfectionnements aux bouches inodores d'égoût
FR813998A (fr)	1937-06-12	Perfectionnements aux étuis pour instruments de musique
FR709887A (fr)	1931-08-14	Instrument de nivellement
FR713386A (fr)	1931-10-27	Perfectionnements aux bouliers destinés à l'enseignement