FR725049A - Appareil pour amplifier les sons - Google Patents

Appareil pour amplifier les sons

Info

Publication number
FR725049A
FR725049A FR725049DA FR725049A FR 725049 A FR725049 A FR 725049A FR 725049D A FR725049D A FR 725049DA FR 725049 A FR725049 A FR 725049A
Authority
FR
France
Prior art keywords
amplifying sounds
sounds
amplifying
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)
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.)
HOOVEN AUTOMATIC TYPEWRITER CO
Original Assignee
HOOVEN AUTOMATIC TYPEWRITER CO
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 HOOVEN AUTOMATIC TYPEWRITER CO filed Critical HOOVEN AUTOMATIC TYPEWRITER CO
Application granted granted Critical
Publication of FR725049A publication Critical patent/FR725049A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/42—Combinations of transducers with fluid-pressure or other non-electrical amplifying means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Toys (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
FR725049D 1931-10-21 1931-10-24 Appareil pour amplifier les sons Expired FR725049A (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB29276/31A GB377511A (en) 1931-10-21 1931-10-21 Improved sound amplifying system
FR725049T 1931-10-24

Publications (1)

Publication Number Publication Date
FR725049A true FR725049A (fr) 1932-05-06

Family

ID=10288968

Family Applications (1)

Application Number Title Priority Date Filing Date
FR725049D Expired FR725049A (fr) 1931-10-21 1931-10-24 Appareil pour amplifier les sons

Country Status (2)

Country Link
FR (1) FR725049A (fr)
GB (1) GB377511A (fr)

Also Published As

Publication number Publication date
GB377511A (en) 1932-07-28

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