GB372400A - Improvements relating to telephone instrument circuits - Google Patents

Improvements relating to telephone instrument circuits

Info

Publication number
GB372400A
GB372400A GB3949/31A GB394931A GB372400A GB 372400 A GB372400 A GB 372400A GB 3949/31 A GB3949/31 A GB 3949/31A GB 394931 A GB394931 A GB 394931A GB 372400 A GB372400 A GB 372400A
Authority
GB
United Kingdom
Prior art keywords
substation
impedances
winding
coil
circuits
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
GB3949/31A
Other languages
English (en)
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
Priority to GB3949/31A priority Critical patent/GB372400A/en
Priority to NL60006A priority patent/NL35830C/xx
Priority to US589472A priority patent/US1919314A/en
Priority to FR732067D priority patent/FR732067A/fr
Priority to BE386269D priority patent/BE386269A/xx
Publication of GB372400A publication Critical patent/GB372400A/en
Priority to GB2661/33A priority patent/GB407808A/en
Priority to GB3238/34A priority patent/GB425566A/en
Priority to US1318A priority patent/US2099381A/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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Springs (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
GB3949/31A 1931-02-07 1931-02-07 Improvements relating to telephone instrument circuits Expired GB372400A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB3949/31A GB372400A (en) 1931-02-07 1931-02-07 Improvements relating to telephone instrument circuits
NL60006A NL35830C (de) 1931-02-07 1932-01-28
US589472A US1919314A (en) 1931-02-07 1932-01-28 Telephone instrument circuit
FR732067D FR732067A (fr) 1931-02-07 1932-02-06 Perfectionnements relatifs aux circuits d'instruments de téléphones
BE386269D BE386269A (de) 1931-02-07 1932-02-06
GB2661/33A GB407808A (en) 1931-02-07 1933-01-27 Improvements in or relating to telephone instrument circuits
GB3238/34A GB425566A (en) 1931-02-07 1934-01-31 Improvements in or relating to telephone instrument circuits
US1318A US2099381A (en) 1931-02-07 1935-01-11 Telephone instrument circuit

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
GB372400A true GB372400A (en) 1932-05-09

Family

ID=32109232

Family Applications (3)

Application Number Title Priority Date Filing Date
GB3949/31A Expired GB372400A (en) 1931-02-07 1931-02-07 Improvements relating to telephone instrument circuits
GB2661/33A Expired GB407808A (en) 1931-02-07 1933-01-27 Improvements in or relating to telephone instrument circuits
GB3238/34A Expired GB425566A (en) 1931-02-07 1934-01-31 Improvements in or relating to telephone instrument circuits

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB2661/33A Expired GB407808A (en) 1931-02-07 1933-01-27 Improvements in or relating to telephone instrument circuits
GB3238/34A Expired GB425566A (en) 1931-02-07 1934-01-31 Improvements in or relating to telephone instrument circuits

Country Status (5)

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

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
BE386269A (de) 1932-03-31
FR732067A (fr) 1932-09-13
US1919314A (en) 1933-07-25
GB425566A (en) 1935-03-18
NL35830C (de) 1935-07-15
GB407808A (en) 1934-03-29
US2099381A (en) 1937-11-16

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