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FR658377A - Improvements to electrical circuit switching mechanisms for automatic telephony - Google Patents

Improvements to electrical circuit switching mechanisms for automatic telephony

Info

Publication number
FR658377A
FR658377A FR658377DA FR658377A FR 658377 A FR658377 A FR 658377A FR 658377D A FR658377D A FR 658377DA FR 658377 A FR658377 A FR 658377A
Authority
FR
France
Prior art keywords
electrical circuit
circuit switching
switching mechanisms
automatic telephony
telephony
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
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR658377A publication Critical patent/FR658377A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR658377D 1928-07-26 1928-07-26 Improvements to electrical circuit switching mechanisms for automatic telephony Expired FR658377A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR658377T 1928-07-26

Publications (1)

Publication Number Publication Date
FR658377A true FR658377A (en) 1929-06-04

Family

ID=9009060

Family Applications (1)

Application Number Title Priority Date Filing Date
FR658377D Expired FR658377A (en) 1928-07-26 1928-07-26 Improvements to electrical circuit switching mechanisms for automatic telephony

Country Status (1)

Country Link
FR (1) FR658377A (en)

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