FR636798A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR636798A
FR636798A FR636798DA FR636798A FR 636798 A FR636798 A FR 636798A FR 636798D A FR636798D A FR 636798DA FR 636798 A FR636798 A FR 636798A
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.)
Automatic Telephone Manufacturing Co Ltd
Original Assignee
Automatic Telephone Manufacturing 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 Automatic Telephone Manufacturing Co Ltd filed Critical Automatic Telephone Manufacturing Co Ltd
Application granted granted Critical
Publication of FR636798A publication Critical patent/FR636798A/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)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
FR636798D 1926-01-16 1926-11-03 Improvements to telephone systems Expired FR636798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1315/26A GB270782A (en) 1926-01-16 1926-01-16 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
FR636798A true FR636798A (en) 1928-04-16

Family

ID=9719841

Family Applications (1)

Application Number Title Priority Date Filing Date
FR636798D Expired FR636798A (en) 1926-01-16 1926-11-03 Improvements to telephone systems

Country Status (4)

Country Link
US (1) US1763901A (en)
BE (1) BE270782A (en)
FR (1) FR636798A (en)
GB (1) GB270782A (en)

Also Published As

Publication number Publication date
GB270782A (en) 1927-05-16
BE270782A (en)
US1763901A (en) 1930-06-17

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