ZA78513B - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
ZA78513B
ZA78513B ZA00780513A ZA78513A ZA78513B ZA 78513 B ZA78513 B ZA 78513B ZA 00780513 A ZA00780513 A ZA 00780513A ZA 78513 A ZA78513 A ZA 78513A ZA 78513 B ZA78513 B ZA 78513B
Authority
ZA
South Africa
Prior art keywords
relating
telephone systems
telephone
systems
Prior art date
Application number
ZA00780513A
Inventor
R Brooksbank
Original Assignee
Plessey Handel Investment Ag
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 Plessey Handel Investment Ag filed Critical Plessey Handel Investment Ag
Publication of ZA78513B publication Critical patent/ZA78513B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
ZA00780513A 1977-02-01 1978-01-27 Improvements in or relating to telephone systems ZA78513B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3984/77A GB1560922A (en) 1977-02-01 1977-02-01 Telephone systems

Publications (1)

Publication Number Publication Date
ZA78513B true ZA78513B (en) 1978-12-27

Family

ID=9768612

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00780513A ZA78513B (en) 1977-02-01 1978-01-27 Improvements in or relating to telephone systems

Country Status (7)

Country Link
AU (1) AU514376B2 (en)
CA (1) CA1116767A (en)
FR (1) FR2379210A1 (en)
GB (1) GB1560922A (en)
IT (1) IT1092555B (en)
NZ (1) NZ186342A (en)
ZA (1) ZA78513B (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1074662B (en) * 1957-10-10 1960-02-04 Pye Limited, Cambridge (Grossbritannien) Automatic telephone system with electronic switching of the ringing current to a subscriber
US3065307A (en) * 1959-10-12 1962-11-20 Automatic Elect Lab Electronic telephone systems and ringing arrangements therefor
FR2216733B1 (en) * 1973-01-31 1978-05-12 Labo Cent Telecommunicat

Also Published As

Publication number Publication date
FR2379210A1 (en) 1978-08-25
NZ186342A (en) 1981-02-11
GB1560922A (en) 1980-02-13
AU3267378A (en) 1979-08-02
IT1092555B (en) 1985-07-12
CA1116767A (en) 1982-01-19
AU514376B2 (en) 1981-02-05
IT7819856A0 (en) 1978-01-31

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