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FR706501A - Improvements to telephone switchboards - Google Patents

Improvements to telephone switchboards

Info

Publication number
FR706501A
FR706501A FR706501DA FR706501A FR 706501 A FR706501 A FR 706501A FR 706501D A FR706501D A FR 706501DA FR 706501 A FR706501 A FR 706501A
Authority
FR
France
Prior art keywords
telephone switchboards
switchboards
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.)
Compagnie des Telephones Thomson Houston
Original Assignee
Compagnie des Telephones Thomson Houston
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 Compagnie des Telephones Thomson Houston filed Critical Compagnie des Telephones Thomson Houston
Application granted granted Critical
Publication of FR706501A publication Critical patent/FR706501A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M5/00—Manual exchanges
    • H04M5/04—Arrangements for indicating calls or supervising connections for calling or clearing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR706501D 1930-02-28 1930-02-28 Improvements to telephone switchboards Expired FR706501A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR706501T 1930-02-28

Publications (1)

Publication Number Publication Date
FR706501A true FR706501A (en) 1931-06-25

Family

ID=9067814

Family Applications (1)

Application Number Title Priority Date Filing Date
FR706501D Expired FR706501A (en) 1930-02-28 1930-02-28 Improvements to telephone switchboards

Country Status (1)

Country Link
FR (1) FR706501A (en)

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