GB1431326A - Keyboard unit for telecommunication equipment - Google Patents

Keyboard unit for telecommunication equipment

Info

Publication number
GB1431326A
GB1431326A GB4818273A GB4818273A GB1431326A GB 1431326 A GB1431326 A GB 1431326A GB 4818273 A GB4818273 A GB 4818273A GB 4818273 A GB4818273 A GB 4818273A GB 1431326 A GB1431326 A GB 1431326A
Authority
GB
United Kingdom
Prior art keywords
unit
memory
codes
entry
keyboard unit
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
GB4818273A
Other languages
English (en)
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.)
Italtel SpA
Original Assignee
Societa Italiana Telecomunicazioni Siemens SpA
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 Societa Italiana Telecomunicazioni Siemens SpA filed Critical Societa Italiana Telecomunicazioni Siemens SpA
Publication of GB1431326A publication Critical patent/GB1431326A/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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Meter Arrangements (AREA)
  • Radio Relay Systems (AREA)
  • Interface Circuits In Exchanges (AREA)
GB4818273A 1973-01-03 1973-10-16 Keyboard unit for telecommunication equipment Expired GB1431326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT19009/73A IT977993B (it) 1973-01-03 1973-01-03 Tastiera di selezione elettroni ca per apparecchi telefonici con emissione di impulsi decadici intercambiabile con il disco com binatore

Publications (1)

Publication Number Publication Date
GB1431326A true GB1431326A (en) 1976-04-07

Family

ID=11153811

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4818273A Expired GB1431326A (en) 1973-01-03 1973-10-16 Keyboard unit for telecommunication equipment

Country Status (13)

Country Link
US (1) US3969592A (enExample)
JP (1) JPS49103510A (enExample)
BE (1) BE809113A (enExample)
BR (1) BR7308267D0 (enExample)
CA (1) CA1000426A (enExample)
CH (1) CH572689A5 (enExample)
DE (1) DE2362721A1 (enExample)
ES (1) ES419125A1 (enExample)
FR (1) FR2212725B1 (enExample)
GB (1) GB1431326A (enExample)
IT (1) IT977993B (enExample)
NL (1) NL7400089A (enExample)
ZA (1) ZA737652B (enExample)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2291656A1 (fr) * 1974-11-14 1976-06-11 Telic Clavier d'appel
US4008379A (en) * 1975-02-14 1977-02-15 San/Bar Corporation Touch-pad to dial conversion unit
DE2522957C3 (de) * 1975-05-23 1978-06-15 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung für über ihre Anschlußleitungen gespeiste Teilnehmerstationen mit Impulstastwahl in Fernmelde-, insbesondere Fernsprechanlagen
DE2541903C3 (de) * 1975-09-19 1979-09-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung für über ihre AnschluBleitiuigen gespeiste Teilnehmerstationen mit Impulstastwahl in Fernmelde-, insbesondere Fernsprechanlagen
US4199750A (en) * 1975-11-10 1980-04-22 Hitachi, Ltd. Key input circuit capable of roll-over operation
US4174891A (en) * 1976-11-15 1979-11-20 Bell & Howell Company Microfilm reader/printer
EP0004901B1 (de) * 1978-04-14 1982-02-17 Siemens Aktiengesellschaft Schaltungsanordnung für über Anschlussleitungen gespeiste Teilnehmerstationen mit Wähleinrichtungen in Fernmelde-, insbesondere Fernsprechanlagen
JPS6211099Y2 (enExample) * 1978-05-09 1987-03-16
US4300829A (en) * 1979-10-30 1981-11-17 Xerox Corporation Cascade illumination and switch control console
JPS58168394A (ja) * 1982-03-30 1983-10-04 Fujitsu Ltd フツキング機能付パルスダイヤラ
US4413159A (en) * 1982-04-02 1983-11-01 Bell Telephone Laboratories, Incorporated Dial pulsing circuit
JPS59147357U (ja) * 1983-03-23 1984-10-02 株式会社大興電機製作所 ダイヤルインパルス送出回路
DE3689653T2 (de) * 1985-07-18 1994-07-21 Alcatel Nv Schalter für fernsprecherlinie.
US7068777B1 (en) * 1999-04-08 2006-06-27 Agere Systems Inc. True DTMF dialer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488451A (en) * 1967-04-05 1970-01-06 Bell Telephone Labor Inc Call transmitter
GB1236961A (en) * 1968-01-12 1971-06-23 Gen Electric Co Ltd Improvements in or relating to electric impulse transmitters
JPS5032569B1 (enExample) * 1968-09-04 1975-10-22
ZA714585B (en) * 1970-07-21 1972-03-29 Modern Tel Ltd Electrical storage circuit
GB1395577A (en) * 1972-05-11 1975-05-29 Standard Telephones Cables Ltd Telephones
US3787639A (en) * 1972-11-16 1974-01-22 Northern Electric Co Pushbutton electronic pulsing dial

Also Published As

Publication number Publication date
CA1000426A (en) 1976-11-23
FR2212725A1 (enExample) 1974-07-26
NL7400089A (enExample) 1974-07-05
JPS49103510A (enExample) 1974-10-01
ES419125A1 (es) 1976-04-16
CH572689A5 (enExample) 1976-02-13
BE809113A (fr) 1974-04-16
FR2212725B1 (enExample) 1976-11-19
US3969592A (en) 1976-07-13
BR7308267D0 (pt) 1974-08-29
IT977993B (it) 1974-09-20
ZA737652B (en) 1974-08-28
DE2362721A1 (de) 1974-07-11
AU6381873A (en) 1975-06-26

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee