GB1542710A - Electronic telephone - Google Patents

Electronic telephone

Info

Publication number
GB1542710A
GB1542710A GB5038276A GB5038276A GB1542710A GB 1542710 A GB1542710 A GB 1542710A GB 5038276 A GB5038276 A GB 5038276A GB 5038276 A GB5038276 A GB 5038276A GB 1542710 A GB1542710 A GB 1542710A
Authority
GB
United Kingdom
Prior art keywords
electronic telephone
telephone
electronic
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
GB5038276A
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.)
Telspec Ltd
Original Assignee
Telspec Ltd
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 Telspec Ltd filed Critical Telspec Ltd
Priority to GB5038276A priority Critical patent/GB1542710A/en
Publication of GB1542710A publication Critical patent/GB1542710A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • 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
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
GB5038276A 1977-12-02 1977-12-02 Electronic telephone Expired GB1542710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5038276A GB1542710A (en) 1977-12-02 1977-12-02 Electronic telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5038276A GB1542710A (en) 1977-12-02 1977-12-02 Electronic telephone

Publications (1)

Publication Number Publication Date
GB1542710A true GB1542710A (en) 1979-03-21

Family

ID=10455710

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5038276A Expired GB1542710A (en) 1977-12-02 1977-12-02 Electronic telephone

Country Status (1)

Country Link
GB (1) GB1542710A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241591A (en) * 1990-06-01 1993-08-31 Rohm Co., Ltd. Telephone system having a dial data changeover switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241591A (en) * 1990-06-01 1993-08-31 Rohm Co., Ltd. Telephone system having a dial data changeover switch

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19971201