FR659070A - Improvements to acoustic devices - Google Patents

Improvements to acoustic devices

Info

Publication number
FR659070A
FR659070A FR659070DA FR659070A FR 659070 A FR659070 A FR 659070A FR 659070D A FR659070D A FR 659070DA FR 659070 A FR659070 A FR 659070A
Authority
FR
France
Prior art keywords
acoustic devices
acoustic
devices
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)
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Application granted granted Critical
Publication of FR659070A publication Critical patent/FR659070A/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; ELECTRIC HEARING AIDS; 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
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR659070D 1927-08-17 1928-08-16 Improvements to acoustic devices Expired FR659070A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US659070XA 1927-08-17 1927-08-17

Publications (1)

Publication Number Publication Date
FR659070A true FR659070A (en) 1929-06-24

Family

ID=22065943

Family Applications (1)

Application Number Title Priority Date Filing Date
FR659070D Expired FR659070A (en) 1927-08-17 1928-08-16 Improvements to acoustic devices

Country Status (1)

Country Link
FR (1) FR659070A (en)

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