BE802750A - Systeme de selection a boutons-poussoirs - Google Patents

Systeme de selection a boutons-poussoirs

Info

Publication number
BE802750A
BE802750A BE2052941A BE2052941A BE802750A BE 802750 A BE802750 A BE 802750A BE 2052941 A BE2052941 A BE 2052941A BE 2052941 A BE2052941 A BE 2052941A BE 802750 A BE802750 A BE 802750A
Authority
BE
Belgium
Prior art keywords
push
selection system
button selection
button
selection
Prior art date
Application number
BE2052941A
Other languages
English (en)
French (fr)
Inventor
W Forrest
Original Assignee
Gte Automatic Electric Lab 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 Gte Automatic Electric Lab Inc filed Critical Gte Automatic Electric Lab Inc
Publication of BE802750A publication Critical patent/BE802750A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
    • 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
BE2052941A 1972-07-25 1973-07-25 Systeme de selection a boutons-poussoirs BE802750A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00275016A US3806662A (en) 1972-07-25 1972-07-25 Building entrance control system with key-pad control

Publications (1)

Publication Number Publication Date
BE802750A true BE802750A (fr) 1974-01-25

Family

ID=23050560

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2052941A BE802750A (fr) 1972-07-25 1973-07-25 Systeme de selection a boutons-poussoirs

Country Status (5)

Country Link
US (1) US3806662A (xx)
BE (1) BE802750A (xx)
CA (1) CA1001273A (xx)
DE (1) DE2336858A1 (xx)
IT (1) IT993606B (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2422806C3 (de) * 1974-05-10 1985-08-29 Neumann Elektronik GmbH, 4330 Mülheim Einrichtung zur Konzentration der Linienwahlmittel in einer tastengesteuerten Sprechanlage
ES2103187B1 (es) * 1994-10-24 1998-04-01 Gorrochategui Grajirena D Javi Sistema de comunicacion de dos hilos, para porteros automaticos.
KR0141159B1 (ko) * 1995-04-17 1998-07-01 김광호 통화중계 및 주택 경비를 위한 집단주택 제어장치
US5784446A (en) * 1996-11-01 1998-07-21 Cms Investors Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484561A (en) * 1966-07-11 1969-12-16 Automatic Elect Lab Apartment telephone-intercom and door release system
US3557318A (en) * 1966-09-29 1971-01-19 American Telephone & Telegraph Apartment house telephone system
FR1569618A (xx) * 1967-12-08 1969-06-06
US3622710A (en) * 1968-12-20 1971-11-23 Electro Dynamics & Telecon Ltd Intercom converter for use with office tone-controlled telephone system
US3708629A (en) * 1970-11-30 1973-01-02 Scovill Manufacturing Co Intercommunication system for apartment, office building and the like

Also Published As

Publication number Publication date
CA1001273A (en) 1976-12-07
IT993606B (it) 1975-09-30
DE2336858A1 (de) 1974-02-07
US3806662A (en) 1974-04-23

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: GTE AUTOMATIC ELECTRIC LABORATORIES INC.

Effective date: 19870731