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Publication of FR609201ApublicationCriticalpatent/FR609201A/fr
G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B3/00—Audible signalling systems, e.g. audible personal calling systems
G08B3/06—Audible signalling systems, e.g. audible personal calling systems using hydraulic transmission; using pneumatic transmission
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FR609201D1925-12-151925-12-15Dispositif branché sur l'aspiration d'un moteur à explosions permettant d'actionner un avertisseur par le vide
ExpiredFR609201A
(fr)
Perfectionnements aux méthodes et aux appareils pour commander des dispositifs actionnés par aspiration en combinaison avec le passage d'aspiration d'un moteur à combustion interne