ZA767328B - Improvements in or relating to telephone apparatus - Google Patents

Improvements in or relating to telephone apparatus

Info

Publication number
ZA767328B
ZA767328B ZA767328A ZA767328A ZA767328B ZA 767328 B ZA767328 B ZA 767328B ZA 767328 A ZA767328 A ZA 767328A ZA 767328 A ZA767328 A ZA 767328A ZA 767328 B ZA767328 B ZA 767328B
Authority
ZA
South Africa
Prior art keywords
relating
telephone apparatus
telephone
Prior art date
Application number
ZA767328A
Inventor
B Athey
Original Assignee
Gen Electric Co 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 Gen Electric Co Ltd filed Critical Gen Electric Co Ltd
Publication of ZA767328B publication Critical patent/ZA767328B/en

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)
ZA767328A 1975-12-16 1976-12-08 Improvements in or relating to telephone apparatus ZA767328B (en)

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
ZA767328B true ZA767328B (en) 1977-11-30

Family

ID=10459992

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA767328A ZA767328B (en) 1975-12-16 1976-12-08 Improvements in or relating to 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
NZ182849A (en) 1981-02-11
GB1556168A (en) 1979-11-21

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