IT1077978B - Impianto interfonico - Google Patents

Impianto interfonico

Info

Publication number
IT1077978B
IT1077978B IT4819577A IT4819577A IT1077978B IT 1077978 B IT1077978 B IT 1077978B IT 4819577 A IT4819577 A IT 4819577A IT 4819577 A IT4819577 A IT 4819577A IT 1077978 B IT1077978 B IT 1077978B
Authority
IT
Italy
Prior art keywords
intercom system
intercom
Prior art date
Application number
IT4819577A
Other languages
English (en)
Original Assignee
Freibogen Anstalt
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 Freibogen Anstalt filed Critical Freibogen Anstalt
Application granted granted Critical
Publication of IT1077978B publication Critical patent/IT1077978B/it

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
IT4819577A 1977-01-27 1977-02-24 Impianto interfonico IT1077978B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH104077A CH614578A5 (en) 1977-01-27 1977-01-27 Intercom system, in particular for use as a door intercom system

Publications (1)

Publication Number Publication Date
IT1077978B true IT1077978B (it) 1985-05-08

Family

ID=4201051

Family Applications (1)

Application Number Title Priority Date Filing Date
IT4819577A IT1077978B (it) 1977-01-27 1977-02-24 Impianto interfonico

Country Status (5)

Country Link
CH (1) CH614578A5 (it)
DE (1) DE2729469C2 (it)
ES (1) ES457209A1 (it)
FR (1) FR2379205A1 (it)
IT (1) IT1077978B (it)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665116A (en) * 1969-12-19 1972-05-23 Fasco Industries Apartment house intercom system
ES396844A1 (es) * 1970-11-10 1974-06-16 Citovox Instalacion interfonica con cerradura electrica y conexio- nes obtenidas por solamente dos cables.
DE2409393B2 (de) * 1974-02-27 1976-07-29 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung fuer eine kleine bis mittlere torfernsprechanlage ohne zentrale steuereinrichtungen mit mehreren von einer torstation erreichbaren hausstationen
US3978468A (en) * 1974-11-11 1976-08-31 Robert F. Moore Intercom call signaling mechanism

Also Published As

Publication number Publication date
CH614578A5 (en) 1979-11-30
ES457209A1 (es) 1978-02-01
FR2379205B1 (it) 1984-05-04
DE2729469A1 (de) 1978-08-03
FR2379205A1 (fr) 1978-08-25
DE2729469C2 (de) 1986-04-24

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