GB1556168A - Telephone apparatus - Google Patents

Telephone apparatus

Info

Publication number
GB1556168A
GB1556168A GB51430/75A GB5143075A GB1556168A GB 1556168 A GB1556168 A GB 1556168A GB 51430/75 A GB51430/75 A GB 51430/75A GB 5143075 A GB5143075 A GB 5143075A GB 1556168 A GB1556168 A GB 1556168A
Authority
GB
United Kingdom
Prior art keywords
telephone apparatus
telephone
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
GB51430/75A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB51430/75A priority Critical patent/GB1556168A/en
Priority to ZA767328A priority patent/ZA767328B/en
Priority to NZ182849A priority patent/NZ182849A/en
Publication of GB1556168A publication Critical patent/GB1556168A/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
    • H04M19/06—Current supply arrangements for telephone systems in which current supply sources at subordinate switching centres are charged from the main exchange
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
GB51430/75A 1975-12-16 1975-12-16 Telephone apparatus Expired GB1556168A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB51430/75A GB1556168A (en) 1975-12-16 1975-12-16 Telephone apparatus
ZA767328A ZA767328B (en) 1975-12-16 1976-12-08 Improvements in or relating to telephone apparatus
NZ182849A NZ182849A (en) 1975-12-16 1976-12-09 Line powered sub-set for push-button calling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB51430/75A GB1556168A (en) 1975-12-16 1975-12-16 Telephone apparatus

Publications (1)

Publication Number Publication Date
GB1556168A true GB1556168A (en) 1979-11-21

Family

ID=10459992

Family Applications (1)

Application Number Title Priority Date Filing Date
GB51430/75A Expired GB1556168A (en) 1975-12-16 1975-12-16 Telephone apparatus

Country Status (3)

Country Link
GB (1) GB1556168A (en)
NZ (1) NZ182849A (en)
ZA (1) ZA767328B (en)

Also Published As

Publication number Publication date
ZA767328B (en) 1977-11-30
NZ182849A (en) 1981-02-11

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee