FR714245A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR714245A
FR714245A FR714245DA FR714245A FR 714245 A FR714245 A FR 714245A FR 714245D A FR714245D A FR 714245DA FR 714245 A FR714245 A FR 714245A
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.)
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 FR714245A publication Critical patent/FR714245A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
FR714245D 1929-07-17 1930-07-01 Improvements to telephone systems Expired FR714245A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB21955/29A GB336627A (en) 1929-07-17 1929-07-17 Improvements in or relating to telephone systems
DE641060T 1930-06-05
FR714245T 1930-07-01

Publications (1)

Publication Number Publication Date
FR714245A true FR714245A (en) 1931-11-18

Family

ID=10171556

Family Applications (1)

Application Number Title Priority Date Filing Date
FR714245D Expired FR714245A (en) 1929-07-17 1930-07-01 Improvements to telephone systems

Country Status (4)

Country Link
US (1) US1820682A (en)
DE (1) DE641060C (en)
FR (1) FR714245A (en)
GB (1) GB336627A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR854039A (en) * 1939-02-24 1940-04-03 Cie Telephones Thomson Houston Improvements to telephone systems

Also Published As

Publication number Publication date
GB336627A (en) 1930-10-17
US1820682A (en) 1931-08-25
DE641060C (en) 1937-01-25

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