FR484039A - Improvements to intercom telephone systems - Google Patents

Improvements to intercom telephone systems

Info

Publication number
FR484039A
FR484039A FR484039DA FR484039A FR 484039 A FR484039 A FR 484039A FR 484039D A FR484039D A FR 484039DA FR 484039 A FR484039 A FR 484039A
Authority
FR
France
Prior art keywords
telephone systems
intercom telephone
intercom
systems
telephone
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.)
Telephone Manufacturing Co Ltd
Original Assignee
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 Telephone Manufacturing Co Ltd filed Critical Telephone Manufacturing Co Ltd
Application granted granted Critical
Publication of FR484039A publication Critical patent/FR484039A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR484039D 1916-07-17 1916-07-17 Improvements to intercom telephone systems Expired FR484039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR484039T 1916-07-17

Publications (1)

Publication Number Publication Date
FR484039A true FR484039A (en) 1917-08-28

Family

ID=1520870

Family Applications (1)

Application Number Title Priority Date Filing Date
FR484039D Expired FR484039A (en) 1916-07-17 1916-07-17 Improvements to intercom telephone systems

Country Status (1)

Country Link
FR (1) FR484039A (en)

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