FR732067A - Improvements relating to telephone instrument circuits - Google Patents

Improvements relating to telephone instrument circuits

Info

Publication number
FR732067A
FR732067A FR732067DA FR732067A FR 732067 A FR732067 A FR 732067A FR 732067D A FR732067D A FR 732067DA FR 732067 A FR732067 A FR 732067A
Authority
FR
France
Prior art keywords
improvements relating
telephone instrument
instrument circuits
circuits
telephone
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
Application number
Other languages
French (fr)
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.)
Filing date
Publication date
Application filed by Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Application granted granted Critical
Publication of FR732067A publication Critical patent/FR732067A/en
Expired legal-status Critical Current

Links

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)
  • Springs (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
FR732067D 1931-02-07 1932-02-06 Improvements relating to telephone instrument circuits Expired FR732067A (en)

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 (en) 1932-09-13

Family

ID=32109232

Family Applications (1)

Application Number Title Priority Date Filing Date
FR732067D Expired FR732067A (en) 1931-02-07 1932-02-06 Improvements relating to telephone instrument circuits

Country Status (5)

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

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

Also Published As

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

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