FR749340A - Perfectionnements aux téléphones automatiques - Google Patents

Perfectionnements aux téléphones automatiques

Info

Publication number
FR749340A
FR749340A FR749340DA FR749340A FR 749340 A FR749340 A FR 749340A FR 749340D A FR749340D A FR 749340DA FR 749340 A FR749340 A FR 749340A
Authority
FR
France
Prior art keywords
automatic telephones
telephones
automatic
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
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
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR749340A publication Critical patent/FR749340A/fr
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)
  • Interface Circuits In Exchanges (AREA)
FR749340D 1932-01-21 1933-01-19 Perfectionnements aux téléphones automatiques Expired FR749340A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE749340X 1932-01-21

Publications (1)

Publication Number Publication Date
FR749340A true FR749340A (fr) 1933-07-22

Family

ID=20323316

Family Applications (1)

Application Number Title Priority Date Filing Date
FR749340D Expired FR749340A (fr) 1932-01-21 1933-01-19 Perfectionnements aux téléphones automatiques

Country Status (2)

Country Link
DE (1) DE604121C (fr)
FR (1) FR749340A (fr)

Also Published As

Publication number Publication date
DE604121C (de) 1934-10-15

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