FR667328A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR667328A
FR667328A FR667328DA FR667328A FR 667328 A FR667328 A FR 667328A FR 667328D A FR667328D A FR 667328DA FR 667328 A FR667328 A FR 667328A
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 FR667328A publication Critical patent/FR667328A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR667328D 1930-06-20 1928-03-27 Improvements to automatic telephone systems Expired FR667328A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR39921T 1930-06-20

Publications (1)

Publication Number Publication Date
FR667328A true FR667328A (en) 1929-10-15

Family

ID=8676256

Family Applications (2)

Application Number Title Priority Date Filing Date
FR667328D Expired FR667328A (en) 1930-06-20 1928-03-27 Improvements to automatic telephone systems
FR39921D Expired FR39921E (en) 1930-06-20 1930-06-20 Further training in automatic telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR39921D Expired FR39921E (en) 1930-06-20 1930-06-20 Further training in automatic telephone systems

Country Status (1)

Country Link
FR (2) FR667328A (en)

Also Published As

Publication number Publication date
FR39921E (en) 1932-03-19

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