ZA737860B - Improvements in and relating to telephone systems - Google Patents

Improvements in and relating to telephone systems

Info

Publication number
ZA737860B
ZA737860B ZA737860A ZA737860A ZA737860B ZA 737860 B ZA737860 B ZA 737860B ZA 737860 A ZA737860 A ZA 737860A ZA 737860 A ZA737860 A ZA 737860A ZA 737860 B ZA737860 B ZA 737860B
Authority
ZA
South Africa
Prior art keywords
relating
telephone systems
telephone
systems
Prior art date
Application number
ZA737860A
Inventor
I Williams
Original Assignee
Thorn General Telephone 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
Priority claimed from GB4716072A external-priority patent/GB1410508A/en
Application filed by Thorn General Telephone Ltd filed Critical Thorn General Telephone Ltd
Publication of ZA737860B publication Critical patent/ZA737860B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42314—Systems providing special services or facilities to subscribers in private branch exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/06—Arrangements for interconnection not involving centralised switching involving combinations of interconnecting lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
ZA737860A 1972-10-12 1973-10-09 Improvements in and relating to telephone systems ZA737860B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4716072A GB1410508A (en) 1972-10-12 1972-10-12 Telephone systems

Publications (1)

Publication Number Publication Date
ZA737860B true ZA737860B (en) 1974-10-30

Family

ID=10443966

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA737860A ZA737860B (en) 1972-10-12 1973-10-09 Improvements in and relating to telephone systems

Country Status (4)

Country Link
IE (1) IE38355B1 (en)
IT (1) IT998744B (en)
SE (1) SE404575B (en)
ZA (1) ZA737860B (en)

Also Published As

Publication number Publication date
SE404575B (en) 1978-10-09
IT998744B (en) 1976-02-20
IE38355L (en) 1974-04-12
IE38355B1 (en) 1978-03-01

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