FR938320A - Intercom device - Google Patents

Intercom device

Info

Publication number
FR938320A
FR938320A FR938320DA FR938320A FR 938320 A FR938320 A FR 938320A FR 938320D A FR938320D A FR 938320DA FR 938320 A FR938320 A FR 938320A
Authority
FR
France
Prior art keywords
intercom device
intercom
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 FR938320A publication Critical patent/FR938320A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones
    • 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
    • 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)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
FR938320D 1942-03-12 1946-08-19 Intercom device Expired FR938320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US434339A US2345046A (en) 1942-03-12 1942-03-12 Intercommunicating system

Publications (1)

Publication Number Publication Date
FR938320A true FR938320A (en) 1948-09-10

Family

ID=23723823

Family Applications (1)

Application Number Title Priority Date Filing Date
FR938320D Expired FR938320A (en) 1942-03-12 1946-08-19 Intercom device

Country Status (4)

Country Link
US (1) US2345046A (en)
BE (1) BE467440A (en)
FR (1) FR938320A (en)
NL (1) NL66226C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606252A (en) * 1945-03-29 1952-08-05 Hartford Nat Bank & Trust Co Loud-speaking telephone arrangement

Also Published As

Publication number Publication date
US2345046A (en) 1944-03-28
BE467440A (en)
NL66226C (en)

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