ES412669A1 - Mejoras en los dispositivos de senalizacion selectiva para telefonia. - Google Patents

Mejoras en los dispositivos de senalizacion selectiva para telefonia.

Info

Publication number
ES412669A1
ES412669A1 ES412669A ES412669A ES412669A1 ES 412669 A1 ES412669 A1 ES 412669A1 ES 412669 A ES412669 A ES 412669A ES 412669 A ES412669 A ES 412669A ES 412669 A1 ES412669 A1 ES 412669A1
Authority
ES
Spain
Prior art keywords
selection
circuit
contact
contacts
coding
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
ES412669A
Other languages
English (en)
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES412669A1 publication Critical patent/ES412669A1/es
Expired legal-status Critical Current

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)
  • Telephone Set Structure (AREA)
  • Push-Button Switches (AREA)
ES412669A 1972-03-16 1973-03-15 Mejoras en los dispositivos de senalizacion selectiva para telefonia. Expired ES412669A1 (es)

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
ES412669A1 true ES412669A1 (es) 1976-01-01

Family

ID=10002987

Family Applications (1)

Application Number Title Priority Date Filing Date
ES412669A Expired ES412669A1 (es) 1972-03-16 1973-03-15 Mejoras en los dispositivos de senalizacion selectiva para telefonia.

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
IE37172L (en) 1973-09-16
ZA73298B (en) 1973-11-28
GB1370221A (en) 1974-10-16
DE2312454A1 (de) 1973-09-20
FR2176144A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-10-26
AU5333273A (en) 1974-09-19
IE37172B1 (en) 1977-05-25

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