BE454663A - - Google Patents

Info

Publication number
BE454663A
BE454663A BE454663DA BE454663A BE 454663 A BE454663 A BE 454663A BE 454663D A BE454663D A BE 454663DA BE 454663 A BE454663 A BE 454663A
Authority
BE
Belgium
Application number
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.)
Publication of BE454663A publication Critical patent/BE454663A/xx

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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/24—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission with indicator element moving about a pivot, e.g. hinged flap or rotating vane

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
BE454663D 1943-02-26 BE454663A (zh)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH903531X 1943-02-26

Publications (1)

Publication Number Publication Date
BE454663A true BE454663A (zh)

Family

ID=4546733

Family Applications (1)

Application Number Title Priority Date Filing Date
BE454663D BE454663A (zh) 1943-02-26

Country Status (3)

Country Link
BE (1) BE454663A (zh)
CH (1) CH233690A (zh)
FR (1) FR903531A (zh)

Also Published As

Publication number Publication date
CH233690A (de) 1944-08-15
FR903531A (fr) 1945-10-08

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