FR660170A - Improvements to systems for central telephone offices - Google Patents

Improvements to systems for central telephone offices

Info

Publication number
FR660170A
FR660170A FR660170DA FR660170A FR 660170 A FR660170 A FR 660170A FR 660170D A FR660170D A FR 660170DA FR 660170 A FR660170 A FR 660170A
Authority
FR
France
Prior art keywords
systems
central telephone
telephone offices
offices
central
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR660170A publication Critical patent/FR660170A/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)
  • Alarm Systems (AREA)
FR660170D 1927-11-02 1928-09-11 Improvements to systems for central telephone offices Expired FR660170A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2929427A GB307368A (en) 1927-11-02 1927-11-02 Improvements in automatic or semi-automatic telephone systems

Publications (1)

Publication Number Publication Date
FR660170A true FR660170A (en) 1929-07-08

Family

ID=10289250

Family Applications (1)

Application Number Title Priority Date Filing Date
FR660170D Expired FR660170A (en) 1927-11-02 1928-09-11 Improvements to systems for central telephone offices

Country Status (2)

Country Link
FR (1) FR660170A (en)
GB (1) GB307368A (en)

Also Published As

Publication number Publication date
GB307368A (en) 1929-03-04

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