FR938541A - Telephone device - Google Patents

Telephone device

Info

Publication number
FR938541A
FR938541A FR938541DA FR938541A FR 938541 A FR938541 A FR 938541A FR 938541D A FR938541D A FR 938541DA FR 938541 A FR938541 A FR 938541A
Authority
FR
France
Prior art keywords
telephone device
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
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 Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Application granted granted Critical
Publication of FR938541A publication Critical patent/FR938541A/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
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
FR938541D 1944-03-25 1946-12-20 Telephone device Expired FR938541A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US528030A US2385515A (en) 1944-03-25 1944-03-25 Intercommunication system

Publications (1)

Publication Number Publication Date
FR938541A true FR938541A (en) 1948-10-18

Family

ID=24103974

Family Applications (1)

Application Number Title Priority Date Filing Date
FR938541D Expired FR938541A (en) 1944-03-25 1946-12-20 Telephone device

Country Status (3)

Country Link
US (1) US2385515A (en)
FR (1) FR938541A (en)
NL (1) NL68231C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632056A (en) * 1947-12-30 1953-03-17 Rauland Corp Busy signal for intercommunicating telephone systems
US2547854A (en) * 1948-02-06 1951-04-03 Webster Electric Co Inc Intercommunication apparatus
US2744966A (en) * 1950-10-05 1956-05-08 Executone Inf Sys Inc Intercommunication system
US2802055A (en) * 1952-08-29 1957-08-06 Siemens Ag Two-way loudspeaker intercommunication system
US2741667A (en) * 1953-02-11 1956-04-10 Commercial Radio Sound Corp Privacy guarded telephone intercommunicating system
BE539028A (en) * 1954-08-23

Also Published As

Publication number Publication date
US2385515A (en) 1945-09-25
NL68231C (en)

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