FR708817A - Improvements to sound equipment - Google Patents

Improvements to sound equipment

Info

Publication number
FR708817A
FR708817A FR708817DA FR708817A FR 708817 A FR708817 A FR 708817A FR 708817D A FR708817D A FR 708817DA FR 708817 A FR708817 A FR 708817A
Authority
FR
France
Prior art keywords
sound equipment
sound
equipment
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.)
Compagnie des Freins Westinghouse
Original Assignee
Compagnie des Freins Westinghouse
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 Compagnie des Freins Westinghouse filed Critical Compagnie des Freins Westinghouse
Application granted granted Critical
Publication of FR708817A publication Critical patent/FR708817A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
    • G10K9/04—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated by compressed gases, e.g. compressed air

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR708817D 1930-02-05 1931-01-03 Improvements to sound equipment Expired FR708817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US708817XA 1930-02-05 1930-02-05

Publications (1)

Publication Number Publication Date
FR708817A true FR708817A (en) 1931-07-29

Family

ID=22097932

Family Applications (1)

Application Number Title Priority Date Filing Date
FR708817D Expired FR708817A (en) 1930-02-05 1931-01-03 Improvements to sound equipment

Country Status (1)

Country Link
FR (1) FR708817A (en)

Similar Documents

Publication Publication Date Title
FR727451A (en) Improvements to filtration devices
FR712387A (en) Loudspeaker enhancements
FR711055A (en) Improvements to the speakers
FR708817A (en) Improvements to sound equipment
FR705658A (en) Loudspeaker enhancements
FR724497A (en) Improvements to indicating devices
FR706783A (en) Improvements to ventilation devices
FR688215A (en) Improvements to filing devices
FR723064A (en) Improvements to television equipment
FR691560A (en) Improvements to sound reproducers
FR716534A (en) Improvements to acoustic devices
FR692380A (en) Improvements to telephone devices
FR688070A (en) Improvements to gavanoplasty devices
FR712483A (en) Improvements to compensating devices
FR709439A (en) Improvements to radio-electric devices
FR718594A (en) Improvements to cinematographic devices
FR710892A (en) Improvements to cinematographic devices
FR709822A (en) Improvements to cinematographic devices
FR695973A (en) Improvements to cinematographic devices
FR717172A (en) Improvements to warning devices
FR689307A (en) Improvements to refrigeration devices
FR699587A (en) Improvements to refrigeration devices
FR687877A (en) Improvements to refrigeration devices
FR704112A (en) Improvements made or relating to cinematographic equipment
FR721699A (en) Improvements to breathing apparatus