GB530257A - Improvements in telephone instrument circuits - Google Patents

Improvements in telephone instrument circuits

Info

Publication number
GB530257A
GB530257A GB16314/39A GB1631439A GB530257A GB 530257 A GB530257 A GB 530257A GB 16314/39 A GB16314/39 A GB 16314/39A GB 1631439 A GB1631439 A GB 1631439A GB 530257 A GB530257 A GB 530257A
Authority
GB
United Kingdom
Prior art keywords
contacts
cradle
shunt
condenser
circuit
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
GB16314/39A
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric Laboratories Inc
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 Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Publication of GB530257A publication Critical patent/GB530257A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Telephonic Communication Services (AREA)
GB16314/39A 1938-07-22 1939-06-02 Improvements in telephone instrument circuits Expired GB530257A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US220757A US2214259A (en) 1938-07-22 1938-07-22 Telephone substation apparatus

Publications (1)

Publication Number Publication Date
GB530257A true GB530257A (en) 1940-12-09

Family

ID=22824830

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16314/39A Expired GB530257A (en) 1938-07-22 1939-06-02 Improvements in telephone instrument circuits

Country Status (3)

Country Link
US (1) US2214259A (enrdf_load_stackoverflow)
BE (1) BE435545A (enrdf_load_stackoverflow)
GB (1) GB530257A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548723A (en) * 1945-07-13 1951-04-10 Kellogg Switchboard & Supply Telephone set hook-switch apparatus
US2529418A (en) * 1947-06-25 1950-11-07 Automatic Elect Lab Telephone substation apparatus for local, and common battery service
BE545243A (enrdf_load_stackoverflow) * 1955-02-17
NL262555A (enrdf_load_stackoverflow) * 1960-03-18

Also Published As

Publication number Publication date
BE435545A (enrdf_load_stackoverflow)
US2214259A (en) 1940-09-10

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