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Publication of FR453162ApublicationCriticalpatent/FR453162A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
H04R1/00—Details of transducers, loudspeakers or microphones
H04R1/12—Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection
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Apparatus For Disinfection Or Sterilisation
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FR453162A1913-01-081913-01-10Support pour appareils téléphoniques et appareils semblables, combiné avec un dispositif de désinfection
ExpiredFR453162A
(fr)