FR671772A - Improvements to automatic or semi-automatic central office telephone systems - Google Patents

Improvements to automatic or semi-automatic central office telephone systems

Info

Publication number
FR671772A
FR671772A FR671772DA FR671772A FR 671772 A FR671772 A FR 671772A FR 671772D A FR671772D A FR 671772DA FR 671772 A FR671772 A FR 671772A
Authority
FR
France
Prior art keywords
automatic
semi
central office
telephone systems
office 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.)
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 FR671772A publication Critical patent/FR671772A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
FR671772D 1928-05-21 1929-03-20 Improvements to automatic or semi-automatic central office telephone systems Expired FR671772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1484628A GB317745A (en) 1928-05-21 1928-05-21 Improvements in and relating to automatic and semi-automatic exchange systems

Publications (1)

Publication Number Publication Date
FR671772A true FR671772A (en) 1929-12-18

Family

ID=10048510

Family Applications (1)

Application Number Title Priority Date Filing Date
FR671772D Expired FR671772A (en) 1928-05-21 1929-03-20 Improvements to automatic or semi-automatic central office telephone systems

Country Status (2)

Country Link
FR (1) FR671772A (en)
GB (1) GB317745A (en)

Also Published As

Publication number Publication date
GB317745A (en) 1929-08-21

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