FR620351A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR620351A
FR620351A FR620351DA FR620351A FR 620351 A FR620351 A FR 620351A FR 620351D A FR620351D A FR 620351DA FR 620351 A FR620351 A FR 620351A
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 FR620351A publication Critical patent/FR620351A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/62—Keyboard equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR620351D 1925-12-24 1925-12-24 Improvements to automatic telephone systems Expired FR620351A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR620351T 1925-12-24

Publications (1)

Publication Number Publication Date
FR620351A true FR620351A (en) 1927-04-21

Family

ID=8984346

Family Applications (1)

Application Number Title Priority Date Filing Date
FR620351D Expired FR620351A (en) 1925-12-24 1925-12-24 Improvements to automatic telephone systems

Country Status (1)

Country Link
FR (1) FR620351A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE767836C (en) * 1934-10-23 1953-11-23 Mix & Genest Ag Circuit arrangement for telephone extension systems with dialer operation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE767836C (en) * 1934-10-23 1953-11-23 Mix & Genest Ag Circuit arrangement for telephone extension systems with dialer operation

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