FR687674A - Perfectionnements aux phonographes - Google Patents

Perfectionnements aux phonographes

Info

Publication number
FR687674A
FR687674A FR687674DA FR687674A FR 687674 A FR687674 A FR 687674A FR 687674D A FR687674D A FR 687674DA FR 687674 A FR687674 A FR 687674A
Authority
FR
France
Prior art keywords
phonographs
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
English (en)
Inventor
Herbert Weisbart Dawkins
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 FR687674A publication Critical patent/FR687674A/fr
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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR687674D 1929-01-05 1930-01-04 Perfectionnements aux phonographes Expired FR687674A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB687674X 1929-01-05

Publications (1)

Publication Number Publication Date
FR687674A true FR687674A (fr) 1930-08-12

Family

ID=10492929

Family Applications (1)

Application Number Title Priority Date Filing Date
FR687674D Expired FR687674A (fr) 1929-01-05 1930-01-04 Perfectionnements aux phonographes

Country Status (1)

Country Link
FR (1) FR687674A (fr)

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