FR703764A - Appareil auditif électrique à l'usage des sourds, comportant un microphone, un téléphone et un dispositif amplificateur intermédiaire
- Google Patents
Appareil auditif électrique à l'usage des sourds, comportant un microphone, un téléphone et un dispositif amplificateur intermédiaire
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Koninklijke Philips NV
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Philips Gloeilampenfabrieken NV
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Application filed by Philips Gloeilampenfabrieken NVfiledCriticalPhilips Gloeilampenfabrieken NV
Application grantedgrantedCritical
Publication of FR703764ApublicationCriticalpatent/FR703764A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
H04R25/04—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception comprising pocket amplifiers
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Health & Medical Sciences
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General Health & Medical Sciences
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Neurosurgery
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Otolaryngology
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Physics & Mathematics
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Engineering & Computer Science
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Acoustics & Sound
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Signal Processing
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Telephone Function
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FR703764D1929-11-231930-10-16Appareil auditif électrique à l'usage des sourds, comportant un microphone, un téléphone et un dispositif amplificateur intermédiaire
ExpiredFR703764A
(fr)
Organe de support et de centrage de la bobine d'un dispositif électrodynamique, permettant de transformer des oscillations électriques en oscillations acoustiques ou inversement