GB372066A - Improvements in telephone systems - Google Patents

Improvements in telephone systems

Info

Publication number
GB372066A
GB372066A GB10530/31A GB1053031A GB372066A GB 372066 A GB372066 A GB 372066A GB 10530/31 A GB10530/31 A GB 10530/31A GB 1053031 A GB1053031 A GB 1053031A GB 372066 A GB372066 A GB 372066A
Authority
GB
United Kingdom
Prior art keywords
relay
signal
operate
cancelled
class
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
GB10530/31A
Other languages
English (en)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 to FR714908D priority Critical patent/FR714908A/fr
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to GB10530/31A priority patent/GB372066A/en
Priority to BE379502D priority patent/BE379502A/xx
Publication of GB372066A publication Critical patent/GB372066A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
GB10530/31A 1931-04-07 1931-04-09 Improvements in telephone systems Expired GB372066A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR714908D FR714908A (fr) 1931-04-07 1931-04-07 Dispositif de réception d'impulsions de courant, en particulier à l'aide de lignesde trnasmission à distance ou de dispositifs analogues
GB10530/31A GB372066A (en) 1931-04-07 1931-04-09 Improvements in telephone systems
BE379502D BE379502A (enrdf_load_stackoverflow) 1931-04-07 1931-05-01

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR714908T 1931-04-07
GB10530/31A GB372066A (en) 1931-04-07 1931-04-09 Improvements in telephone systems
BE379502T 1931-05-01

Publications (1)

Publication Number Publication Date
GB372066A true GB372066A (en) 1932-05-05

Family

ID=40498641

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10530/31A Expired GB372066A (en) 1931-04-07 1931-04-09 Improvements in telephone systems

Country Status (3)

Country Link
BE (1) BE379502A (enrdf_load_stackoverflow)
FR (1) FR714908A (enrdf_load_stackoverflow)
GB (1) GB372066A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE379502A (enrdf_load_stackoverflow) 1931-06-30
FR714908A (fr) 1931-11-23

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