FR1396883A - Système d'intercommunication - Google Patents

Système d'intercommunication

Info

Publication number
FR1396883A
FR1396883A FR976404A FR976404A FR1396883A FR 1396883 A FR1396883 A FR 1396883A FR 976404 A FR976404 A FR 976404A FR 976404 A FR976404 A FR 976404A FR 1396883 A FR1396883 A FR 1396883A
Authority
FR
France
Prior art keywords
intercom system
intercom
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
FR976404A
Other languages
English (en)
Inventor
Guenther Rahmig
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 FR976404A priority Critical patent/FR1396883A/fr
Application granted granted Critical
Publication of FR1396883A publication Critical patent/FR1396883A/fr
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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR976404A 1964-05-29 1964-05-29 Système d'intercommunication Expired FR1396883A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR976404A FR1396883A (fr) 1964-05-29 1964-05-29 Système d'intercommunication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR976404A FR1396883A (fr) 1964-05-29 1964-05-29 Système d'intercommunication

Publications (1)

Publication Number Publication Date
FR1396883A true FR1396883A (fr) 1965-04-23

Family

ID=8831226

Family Applications (1)

Application Number Title Priority Date Filing Date
FR976404A Expired FR1396883A (fr) 1964-05-29 1964-05-29 Système d'intercommunication

Country Status (1)

Country Link
FR (1) FR1396883A (fr)

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