ZA71885B - Improvements in or relating to telephone instruments - Google Patents

Improvements in or relating to telephone instruments

Info

Publication number
ZA71885B
ZA71885B ZA710885A ZA71885A ZA71885B ZA 71885 B ZA71885 B ZA 71885B ZA 710885 A ZA710885 A ZA 710885A ZA 71885 A ZA71885 A ZA 71885A ZA 71885 B ZA71885 B ZA 71885B
Authority
ZA
South Africa
Prior art keywords
relating
telephone instruments
instruments
telephone
Prior art date
Application number
ZA710885A
Inventor
R Stevenson
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 ZA71885B publication Critical patent/ZA71885B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
ZA710885A 1970-02-12 1971-02-12 Improvements in or relating to telephone instruments ZA71885B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6919/70A GB1298449A (en) 1970-02-12 1970-02-12 Improvements in or relating to telephone instruments

Publications (1)

Publication Number Publication Date
ZA71885B true ZA71885B (en) 1972-02-23

Family

ID=9823253

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA710885A ZA71885B (en) 1970-02-12 1971-02-12 Improvements in or relating to telephone instruments

Country Status (3)

Country Link
AU (1) AU2539671A (en)
GB (1) GB1298449A (en)
ZA (1) ZA71885B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282198A1 (en) * 1974-08-12 1976-03-12 Trt Telecom Radio Electr Keyboard telephone for long lines - uses speech loop current to power MOS circuit
GB2242793B (en) * 1990-04-05 1994-08-10 Technophone Ltd Battery charging apparatus

Also Published As

Publication number Publication date
AU2539671A (en) 1972-08-17
GB1298449A (en) 1972-12-06

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