GB1440542A - Push-button calling circuits for telephone sets - Google Patents

Push-button calling circuits for telephone sets

Info

Publication number
GB1440542A
GB1440542A GB3357774A GB3357774A GB1440542A GB 1440542 A GB1440542 A GB 1440542A GB 3357774 A GB3357774 A GB 3357774A GB 3357774 A GB3357774 A GB 3357774A GB 1440542 A GB1440542 A GB 1440542A
Authority
GB
United Kingdom
Prior art keywords
push
telephone sets
calling circuits
button calling
button
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
GB3357774A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1440542A publication Critical patent/GB1440542A/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)
GB3357774A 1973-08-03 1974-07-30 Push-button calling circuits for telephone sets Expired GB1440542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES417537A ES417537A1 (es) 1973-08-03 1973-08-03 Mejoras en los circuitos de llamada por pulsador para apa- ratos telefonicos.

Publications (1)

Publication Number Publication Date
GB1440542A true GB1440542A (en) 1976-06-23

Family

ID=8464781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3357774A Expired GB1440542A (en) 1973-08-03 1974-07-30 Push-button calling circuits for telephone sets

Country Status (3)

Country Link
ES (1) ES417537A1 (enrdf_load_stackoverflow)
FR (1) FR2239828B1 (enrdf_load_stackoverflow)
GB (1) GB1440542A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081619A (en) * 1975-09-19 1978-03-28 Siemens Aktiengesellschaft Switching arrangement for telecommunication subscriber stations using key-operated selection units

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027302A1 (en) * 1979-10-10 1981-04-22 Suchi Chiou Interface circuits for touch-pulse telephones
FR2505586A1 (fr) * 1981-05-05 1982-11-12 Thomson Csf Mat Tel Poste telephonique a clavier
FR2508744A1 (fr) * 1981-06-26 1982-12-31 Thomson Csf Mat Tel Poste telephonique a clavier et a ecoute amplifiee

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081619A (en) * 1975-09-19 1978-03-28 Siemens Aktiengesellschaft Switching arrangement for telecommunication subscriber stations using key-operated selection units

Also Published As

Publication number Publication date
FR2239828A1 (enrdf_load_stackoverflow) 1975-02-28
FR2239828B1 (enrdf_load_stackoverflow) 1978-02-17
ES417537A1 (es) 1976-03-01
AU7177074A (en) 1976-01-29

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee