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G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B9/00—Order telegraph apparatus, i.e. means for transmitting one of a finite number of different orders at the discretion of the user, e.g. bridge to engine room orders in ships
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FR463329D1913-10-071913-10-07Appareil de signalisation électrique pour télégraphes de bateaux et applications similaires
ExpiredFR463329A
(fr)