FR507681A - Improvements to telephone circuits - Google Patents

Improvements to telephone circuits

Info

Publication number
FR507681A
FR507681A FR507681A FR507681DA FR507681A FR 507681 A FR507681 A FR 507681A FR 507681 A FR507681 A FR 507681A FR 507681D A FR507681D A FR 507681DA FR 507681 A FR507681 A FR 507681A
Authority
FR
France
Prior art keywords
telephone circuits
telephone
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
FR507681A
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.)
Relay Automatic Telephone Company Ltd
Original Assignee
Relay Automatic Telephone Company 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 Relay Automatic Telephone Company Ltd filed Critical Relay Automatic Telephone Company Ltd
Application granted granted Critical
Publication of FR507681A publication Critical patent/FR507681A/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)
FR507681A 1919-01-09 1919-12-24 Improvements to telephone circuits Expired FR507681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB507681X 1919-01-09

Publications (1)

Publication Number Publication Date
FR507681A true FR507681A (en) 1920-09-21

Family

ID=10457279

Family Applications (1)

Application Number Title Priority Date Filing Date
FR507681A Expired FR507681A (en) 1919-01-09 1919-12-24 Improvements to telephone circuits

Country Status (1)

Country Link
FR (1) FR507681A (en)

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