FR499198A - Perfectionnements aux phonographes - Google Patents

Perfectionnements aux phonographes

Info

Publication number
FR499198A
FR499198A FR499198A FR499198DA FR499198A FR 499198 A FR499198 A FR 499198A FR 499198 A FR499198 A FR 499198A FR 499198D A FR499198D A FR 499198DA FR 499198 A FR499198 A FR 499198A
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
FR499198A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LEKTOPHONE CORP
Original Assignee
LEKTOPHONE CORP
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 by LEKTOPHONE CORP filed Critical LEKTOPHONE CORP
Application granted granted Critical
Publication of FR499198A publication Critical patent/FR499198A/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
    • H04R7/12—Non-planar diaphragms or cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR499198A 1918-05-09 1919-05-08 Perfectionnements aux phonographes Expired FR499198A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US499198XA 1918-05-09 1918-05-09

Publications (1)

Publication Number Publication Date
FR499198A true FR499198A (fr) 1920-02-03

Family

ID=1534283

Family Applications (1)

Application Number Title Priority Date Filing Date
FR499198A Expired FR499198A (fr) 1918-05-09 1919-05-08 Perfectionnements aux phonographes

Country Status (1)

Country Link
FR (1) FR499198A (fr)

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