FR729878A - Improvements to hearing devices - Google Patents

Improvements to hearing devices

Info

Publication number
FR729878A
FR729878A FR729878DA FR729878A FR 729878 A FR729878 A FR 729878A FR 729878D A FR729878D A FR 729878DA FR 729878 A FR729878 A FR 729878A
Authority
FR
France
Prior art keywords
hearing devices
hearing
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.)
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 FR729878A publication Critical patent/FR729878A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR729878D 1932-01-16 1932-01-16 Improvements to hearing devices Expired FR729878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR729878T 1932-01-16

Publications (1)

Publication Number Publication Date
FR729878A true FR729878A (en) 1932-08-02

Family

ID=9112707

Family Applications (1)

Application Number Title Priority Date Filing Date
FR729878D Expired FR729878A (en) 1932-01-16 1932-01-16 Improvements to hearing devices

Country Status (1)

Country Link
FR (1) FR729878A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2848415A1 (en) * 1978-02-22 1979-08-23 Fiamm Spa SIGNAL HORN FOR A PNEUMATIC ACOUSTIC SIGNAL GENERATOR
WO2006062490A1 (en) * 2004-12-10 2006-06-15 Jameleddine Fekih Sound generator equipped with a horn

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2848415A1 (en) * 1978-02-22 1979-08-23 Fiamm Spa SIGNAL HORN FOR A PNEUMATIC ACOUSTIC SIGNAL GENERATOR
WO2006062490A1 (en) * 2004-12-10 2006-06-15 Jameleddine Fekih Sound generator equipped with a horn

Similar Documents

Publication Publication Date Title
FR735186A (en) Improvements to sanitary devices
FR765048A (en) Improvements to filtering devices
FR729878A (en) Improvements to hearing devices
FR42803E (en) Loudspeaker enhancements
FR42419E (en) Improvements to hearing devices
FR753820A (en) Improvements to hearing devices
FR754784A (en) Improvements to refrigeration devices
FR760450A (en) Improvements to automatic screening-weighing-bagging devices
FR755710A (en) Improvements to radiotelephony receiving devices
FR746719A (en) Improvements to sanitary devices
FR753357A (en) Improvements to kymography devices
FR747434A (en) Improvements to drawing devices
FR760961A (en) Improvements to hearing devices
FR753232A (en) Improvements to television sets
FR761063A (en) Improvements to television sets
FR731544A (en) Improvements to hearing devices
FR747925A (en) Improvements to mixing devices
FR748988A (en) Improvements to cinematographic devices
FR759347A (en) Improvements to cinematographic devices
FR731091A (en) Improvements to projection devices
FR42187E (en) Improvements made to cremones
FR736505A (en) Improvements to flying devices
FR751739A (en) Improvements to filtering devices
FR760438A (en) Improvements to drawing devices
FR755120A (en) Improvements to refrigeration devices