FR721123A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR721123A
FR721123A FR721123DA FR721123A FR 721123 A FR721123 A FR 721123A FR 721123D A FR721123D A FR 721123DA FR 721123 A FR721123 A FR 721123A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co Ltd
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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Application granted granted Critical
Publication of FR721123A publication Critical patent/FR721123A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
FR721123D 1930-08-07 1931-08-07 Improvements to telephone systems Expired FR721123A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23674/30A GB355924A (en) 1930-08-07 1930-08-07 Improvements relating to automatic telephone systems

Publications (1)

Publication Number Publication Date
FR721123A true FR721123A (en) 1932-02-29

Family

ID=10199435

Family Applications (1)

Application Number Title Priority Date Filing Date
FR721123D Expired FR721123A (en) 1930-08-07 1931-08-07 Improvements to telephone systems

Country Status (4)

Country Link
US (1) US1922237A (en)
DE (1) DE619686C (en)
FR (1) FR721123A (en)
GB (1) GB355924A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB592989A (en) * 1945-05-04 1947-10-06 Siemens Brothers & Co Ltd Improvements relating to automatic telephone systems
GB592371A (en) * 1945-05-04 1947-09-16 Siemens Brothers & Co Ltd Improvements relating to automatic telephone systems
GB605131A (en) * 1945-12-14 1948-07-16 Siemens Brothers & Co Ltd Improvements relating to telephone and like selective systems
NL65863C (en) * 1946-01-30
NL65451C (en) * 1946-08-01
FR928167A (en) * 1947-02-14 1947-11-20 Constr Telephoniques Improvements to telephone systems
FR996361A (en) * 1948-10-25 1951-12-17
DE929308C (en) * 1950-10-25 1955-06-23 Siemens Ag Circuit arrangement for rerouting connections to different traffic directions in telephone systems with dialer operation

Also Published As

Publication number Publication date
GB355924A (en) 1931-09-03
DE619686C (en) 1935-10-08
US1922237A (en) 1933-08-15

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