FR1317055A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR1317055A
FR1317055A FR890425A FR890425A FR1317055A FR 1317055 A FR1317055 A FR 1317055A FR 890425 A FR890425 A FR 890425A FR 890425 A FR890425 A FR 890425A FR 1317055 A FR1317055 A FR 1317055A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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
FR890425A
Other languages
French (fr)
Inventor
Eigil Cohrt
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to FR890425A priority Critical patent/FR1317055A/en
Application granted granted Critical
Publication of FR1317055A publication Critical patent/FR1317055A/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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR890425A 1961-03-08 1962-03-08 Improvements to telephone systems Expired FR1317055A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR890425A FR1317055A (en) 1961-03-08 1962-03-08 Improvements to telephone systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK101361 1961-03-08
FR890425A FR1317055A (en) 1961-03-08 1962-03-08 Improvements to telephone systems

Publications (1)

Publication Number Publication Date
FR1317055A true FR1317055A (en) 1963-02-01

Family

ID=26065060

Family Applications (1)

Application Number Title Priority Date Filing Date
FR890425A Expired FR1317055A (en) 1961-03-08 1962-03-08 Improvements to telephone systems

Country Status (1)

Country Link
FR (1) FR1317055A (en)

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