BE870388R - CIRCUIT FOR A CALL, TALK AND DOOR OPERATOR SYSTEM - Google Patents

CIRCUIT FOR A CALL, TALK AND DOOR OPERATOR SYSTEM

Info

Publication number
BE870388R
BE870388R BE2057265A BE2057265A BE870388R BE 870388 R BE870388 R BE 870388R BE 2057265 A BE2057265 A BE 2057265A BE 2057265 A BE2057265 A BE 2057265A BE 870388 R BE870388 R BE 870388R
Authority
BE
Belgium
Prior art keywords
talk
call
circuit
door operator
operator system
Prior art date
Application number
BE2057265A
Other languages
Dutch (nl)
Original Assignee
Siedle & Soehne S
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 Siedle & Soehne S filed Critical Siedle & Soehne S
Application granted granted Critical
Publication of BE870388R publication Critical patent/BE870388R/en

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)
BE2057265A 1977-09-13 1978-09-12 CIRCUIT FOR A CALL, TALK AND DOOR OPERATOR SYSTEM BE870388R (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2741160A DE2741160C2 (en) 1977-09-13 1977-09-13 Circuit arrangement for a call, intercom and door opener system

Publications (1)

Publication Number Publication Date
BE870388R true BE870388R (en) 1979-01-02

Family

ID=6018834

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2057265A BE870388R (en) 1977-09-13 1978-09-12 CIRCUIT FOR A CALL, TALK AND DOOR OPERATOR SYSTEM

Country Status (6)

Country Link
BE (1) BE870388R (en)
CH (1) CH632623A5 (en)
DE (1) DE2741160C2 (en)
FR (1) FR2402978A2 (en)
NL (1) NL7808822A (en)
SE (1) SE427232B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1165528B (en) * 1980-12-15 1987-04-22 Urmet Spa DOOR PHONE SYSTEM WITH IMAGE TRANSMISSION USING FOUR COMMON CONDUCTORS AND A SELECTION CONDUCTOR FOR EACH INTERNAL STATION
DE4130101C1 (en) * 1991-09-11 1993-02-04 Ritto-Werk Loh Gmbh & Co Kg, 6342 Haiger, De Door intercom with door-opening button - centrally generates call signal and feeds to individual internal intercoms using circuit including two series-connected Zener diodes and parallel decoupling diode

Also Published As

Publication number Publication date
DE2741160C2 (en) 1985-05-09
SE7809541L (en) 1979-03-14
CH632623A5 (en) 1982-10-15
FR2402978A2 (en) 1979-04-06
NL7808822A (en) 1979-03-15
DE2741160A1 (en) 1979-04-12
SE427232B (en) 1983-03-14

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: S. SIEDLE & SOHNE TELEFON- UND TELEGRAFENWERKE G.

Effective date: 19850930