FR647751A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR647751A
FR647751A FR647751DA FR647751A FR 647751 A FR647751 A FR 647751A FR 647751D A FR647751D A FR 647751DA FR 647751 A FR647751 A FR 647751A
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 FR647751A publication Critical patent/FR647751A/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)
  • Alarm Systems (AREA)
FR647751D 1927-01-27 1927-12-30 Improvements to telephone systems Expired FR647751A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB243927A GB289532A (en) 1927-01-27 1927-01-27 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
FR647751A true FR647751A (en) 1928-11-30

Family

ID=9739591

Family Applications (1)

Application Number Title Priority Date Filing Date
FR647751D Expired FR647751A (en) 1927-01-27 1927-12-30 Improvements to telephone systems

Country Status (2)

Country Link
FR (1) FR647751A (en)
GB (1) GB289532A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956698C (en) * 1953-01-12 1957-01-24 Western Electric Co Circuit arrangement for a rotary dial call finder for self-connecting telephone systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956698C (en) * 1953-01-12 1957-01-24 Western Electric Co Circuit arrangement for a rotary dial call finder for self-connecting telephone systems

Also Published As

Publication number Publication date
GB289532A (en) 1928-04-27

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