BE538293A - - Google Patents

Info

Publication number
BE538293A
BE538293A BE538293DA BE538293A BE 538293 A BE538293 A BE 538293A BE 538293D A BE538293D A BE 538293DA BE 538293 A BE538293 A BE 538293A
Authority
BE
Belgium
Prior art keywords
membrane
sound waves
receiver
contact
pressure
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE538293A publication Critical patent/BE538293A/fr

Links

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00Audible signalling systems; Audible personal calling systems

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
BE538293D BE538293A (enExample)

Publications (1)

Publication Number Publication Date
BE538293A true BE538293A (enExample)

Family

ID=168373

Family Applications (1)

Application Number Title Priority Date Filing Date
BE538293D BE538293A (enExample)

Country Status (1)

Country Link
BE (1) BE538293A (enExample)

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