FR629974A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR629974A
FR629974A FR629974DA FR629974A FR 629974 A FR629974 A FR 629974A FR 629974D A FR629974D A FR 629974DA FR 629974 A FR629974 A FR 629974A
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of FR629974A publication Critical patent/FR629974A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
FR629974D 1926-03-22 1927-03-01 Improvements to telephone systems Expired FR629974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7891/26A GB272628A (en) 1926-03-22 1926-03-22 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
FR629974A true FR629974A (en) 1927-11-21

Family

ID=9841780

Family Applications (1)

Application Number Title Priority Date Filing Date
FR629974D Expired FR629974A (en) 1926-03-22 1927-03-01 Improvements to telephone systems

Country Status (4)

Country Link
US (1) US1777049A (en)
DE (1) DE534092C (en)
FR (1) FR629974A (en)
GB (1) GB272628A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR915350A (en) * 1945-05-12 1946-11-26

Also Published As

Publication number Publication date
US1777049A (en) 1930-09-30
GB272628A (en) 1927-06-22
DE534092C (en) 1931-09-25

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