FR708703A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR708703A
FR708703A FR708703DA FR708703A FR 708703 A FR708703 A FR 708703A FR 708703D A FR708703D A FR 708703DA FR 708703 A FR708703 A FR 708703A
Authority
FR
France
Prior art keywords
telephone systems
automatic telephone
automatic
systems
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 FR708703A publication Critical patent/FR708703A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR708703D 1930-04-07 1930-04-07 Improvements to automatic telephone systems Expired FR708703A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR708703T 1930-04-07

Publications (1)

Publication Number Publication Date
FR708703A true FR708703A (en) 1931-07-28

Family

ID=9069072

Family Applications (1)

Application Number Title Priority Date Filing Date
FR708703D Expired FR708703A (en) 1930-04-07 1930-04-07 Improvements to automatic telephone systems

Country Status (1)

Country Link
FR (1) FR708703A (en)

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