CA1001273A - Selection system with keypad control - Google Patents

Selection system with keypad control

Info

Publication number
CA1001273A
CA1001273A CA170,817A CA170817A CA1001273A CA 1001273 A CA1001273 A CA 1001273A CA 170817 A CA170817 A CA 170817A CA 1001273 A CA1001273 A CA 1001273A
Authority
CA
Canada
Prior art keywords
selection system
keypad control
keypad
control
selection
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
CA170,817A
Other languages
English (en)
Other versions
CA170817S (en
Inventor
Wilfrid Forrest
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.)
GTE Automatic Electric Laboratories Inc
Original Assignee
GTE 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 GTE Automatic Electric Laboratories Inc filed Critical GTE Automatic Electric Laboratories Inc
Application granted granted Critical
Publication of CA1001273A publication Critical patent/CA1001273A/en
Expired legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Lock And Its Accessories (AREA)
CA170,817A 1972-07-25 1973-05-09 Selection system with keypad control Expired CA1001273A (en)

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
CA1001273A true CA1001273A (en) 1976-12-07

Family

ID=23050560

Family Applications (1)

Application Number Title Priority Date Filing Date
CA170,817A Expired CA1001273A (en) 1972-07-25 1973-05-09 Selection system with keypad control

Country Status (5)

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

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 (it) * 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
US3806662A (en) 1974-04-23
BE802750A (fr) 1974-01-25
DE2336858A1 (de) 1974-02-07
IT993606B (it) 1975-09-30

Similar Documents

Publication Publication Date Title
CA1002607A (en) Priority channel scanning system with dual response time control
AU464493B2 (en) Boiler-turbine control system
CA979329A (en) Single lever control
AU464991B2 (en) Variabole resistaance control
AU465227B2 (en) Momenary switch control
CA1001273A (en) Selection system with keypad control
CA984919A (en) Sequence counter control arrangement
CA970650A (en) Line break control
CA985351A (en) Control switch unit
CA979787A (en) Single lever control
CA1001272A (en) Key-pad control arrangement
AU454554B2 (en) Transmission control arrangements
AU5288373A (en) Control system
CA895552A (en) Dual control system
CA914785A (en) Optimizing control system
CA916796A (en) Control system
CA892217A (en) Control system
CA910992A (en) Control system
CA900297A (en) Bumpless-transfer control system
CA893348A (en) Movement control
CA977247A (en) Lever control
CA992838A (en) Lever control
CA910972A (en) Telecommunication control system
CA902960A (en) Transmission control
CA906885A (en) Transmission control