NL7808822A - CIRCUIT FOR A CALL, SPEAK AND DOOR OPERATION SYSTEM. - Google Patents

CIRCUIT FOR A CALL, SPEAK AND DOOR OPERATION SYSTEM.

Info

Publication number
NL7808822A
NL7808822A NL7808822A NL7808822A NL7808822A NL 7808822 A NL7808822 A NL 7808822A NL 7808822 A NL7808822 A NL 7808822A NL 7808822 A NL7808822 A NL 7808822A NL 7808822 A NL7808822 A NL 7808822A
Authority
NL
Netherlands
Prior art keywords
speak
call
circuit
operation system
door operation
Prior art date
Application number
NL7808822A
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
Publication of NL7808822A publication Critical patent/NL7808822A/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)
NL7808822A 1977-09-13 1978-08-25 CIRCUIT FOR A CALL, SPEAK AND DOOR OPERATION SYSTEM. NL7808822A (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
NL7808822A true NL7808822A (en) 1979-03-15

Family

ID=6018834

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7808822A NL7808822A (en) 1977-09-13 1978-08-25 CIRCUIT FOR A CALL, SPEAK AND DOOR OPERATION 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
BE870388R (en) 1979-01-02
DE2741160A1 (en) 1979-04-12
CH632623A5 (en) 1982-10-15
SE427232B (en) 1983-03-14
FR2402978A2 (en) 1979-04-06
SE7809541L (en) 1979-03-14
DE2741160C2 (en) 1985-05-09

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Legal Events

Date Code Title Description
A85 Still pending on 85-01-01
BV The patent application has lapsed