FR674270A - Acoustic device - Google Patents

Acoustic device

Info

Publication number
FR674270A
FR674270A FR674270DA FR674270A FR 674270 A FR674270 A FR 674270A FR 674270D A FR674270D A FR 674270DA FR 674270 A FR674270 A FR 674270A
Authority
FR
France
Prior art keywords
acoustic device
acoustic
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
Sigismund Karel Dorotheus Van
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 FR674270A publication Critical patent/FR674270A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR674270D 1929-04-30 1929-04-30 Acoustic device Expired FR674270A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR674270T 1929-04-30

Publications (1)

Publication Number Publication Date
FR674270A true FR674270A (en) 1930-01-27

Family

ID=9018636

Family Applications (1)

Application Number Title Priority Date Filing Date
FR674270D Expired FR674270A (en) 1929-04-30 1929-04-30 Acoustic device

Country Status (1)

Country Link
FR (1) FR674270A (en)

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