FR687552A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR687552A
FR687552A FR687552DA FR687552A FR 687552 A FR687552 A FR 687552A FR 687552D A FR687552D A FR 687552DA FR 687552 A FR687552 A FR 687552A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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 FR687552A publication Critical patent/FR687552A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR687552D 1929-03-27 1929-03-27 Improvements to telephone systems Expired FR687552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR687552T 1929-03-27

Publications (1)

Publication Number Publication Date
FR687552A true FR687552A (en) 1930-08-11

Family

ID=9026210

Family Applications (1)

Application Number Title Priority Date Filing Date
FR687552D Expired FR687552A (en) 1929-03-27 1929-03-27 Improvements to telephone systems

Country Status (1)

Country Link
FR (1) FR687552A (en)

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