FR952595A - Improvements to instruments and telephone devices - Google Patents

Improvements to instruments and telephone devices

Info

Publication number
FR952595A
FR952595A FR952595DA FR952595A FR 952595 A FR952595 A FR 952595A FR 952595D A FR952595D A FR 952595DA FR 952595 A FR952595 A FR 952595A
Authority
FR
France
Prior art keywords
instruments
telephone devices
telephone
devices
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)
Inventor
Charles Bailey
Charles Noel Bailey
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 filed Critical
Application granted granted Critical
Publication of FR952595A publication Critical patent/FR952595A/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
    • 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
FR952595D 1946-09-12 1947-08-29 Improvements to instruments and telephone devices Expired FR952595A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB952595X 1946-09-12

Publications (1)

Publication Number Publication Date
FR952595A true FR952595A (en) 1949-11-21

Family

ID=10785690

Family Applications (1)

Application Number Title Priority Date Filing Date
FR952595D Expired FR952595A (en) 1946-09-12 1947-08-29 Improvements to instruments and telephone devices

Country Status (1)

Country Link
FR (1) FR952595A (en)

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