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FR728552A - Gramophone refinements - Google Patents

Gramophone refinements

Info

Publication number
FR728552A
FR728552A FR728552DA FR728552A FR 728552 A FR728552 A FR 728552A FR 728552D A FR728552D A FR 728552DA FR 728552 A FR728552 A FR 728552A
Authority
FR
France
Prior art keywords
gramophone
refinements
gramophone refinements
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
Karl Hedmark
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 FR728552A publication Critical patent/FR728552A/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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR728552D 1930-10-08 1931-08-31 Gramophone refinements Expired FR728552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE728552X 1930-10-08

Publications (1)

Publication Number Publication Date
FR728552A true FR728552A (en) 1932-07-07

Family

ID=20316192

Family Applications (1)

Application Number Title Priority Date Filing Date
FR728552D Expired FR728552A (en) 1930-10-08 1931-08-31 Gramophone refinements

Country Status (1)

Country Link
FR (1) FR728552A (en)

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