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Publication of FR1219241ApublicationCriticalpatent/FR1219241A/fr
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
H04R1/12—Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection
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FR778232A1957-11-071958-11-04Procédé et appareil pour rendre hygiénique l'embouchure d'un récepteur téléphonique ou dispositif analogue
ExpiredFR1219241A
(fr)