ZA73298B - Improvements relating to push-button signalling systems for telephone instruments - Google Patents

Improvements relating to push-button signalling systems for telephone instruments

Info

Publication number
ZA73298B
ZA73298B ZA730298A ZA73298A ZA73298B ZA 73298 B ZA73298 B ZA 73298B ZA 730298 A ZA730298 A ZA 730298A ZA 73298 A ZA73298 A ZA 73298A ZA 73298 B ZA73298 B ZA 73298B
Authority
ZA
South Africa
Prior art keywords
push
improvements relating
button signalling
signalling systems
telephone instruments
Prior art date
Application number
ZA730298A
Other languages
English (en)
Inventor
A Beadle
R Parrish
R Pickvance
Original Assignee
Standard Telephones Cables 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 Standard Telephones Cables Ltd filed Critical Standard Telephones Cables Ltd
Publication of ZA73298B publication Critical patent/ZA73298B/xx

Links

Classifications

    • 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)
  • Selective Calling Equipment (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)
ZA730298A 1972-03-16 1973-01-16 Improvements relating to push-button signalling systems for telephone instruments ZA73298B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1235472A GB1370221A (en) 1972-03-16 1972-03-16 Push button signalling systems for telephone instruments

Publications (1)

Publication Number Publication Date
ZA73298B true ZA73298B (en) 1973-11-28

Family

ID=10002987

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA730298A ZA73298B (en) 1972-03-16 1973-01-16 Improvements relating to push-button signalling systems for telephone instruments

Country Status (6)

Country Link
DE (1) DE2312454A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES412669A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2176144A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1370221A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IE (1) IE37172B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ZA (1) ZA73298B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Also Published As

Publication number Publication date
IE37172B1 (en) 1977-05-25
FR2176144A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-10-26
ES412669A1 (es) 1976-01-01
GB1370221A (en) 1974-10-16
DE2312454A1 (de) 1973-09-20
IE37172L (en) 1973-09-16
AU5333273A (en) 1974-09-19

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