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HENRY MARTINY
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HENRY MARTINY
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Publication of FR527451ApublicationCriticalpatent/FR527451A/en
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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Physics & Mathematics
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General Physics & Mathematics
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FR527451D1919-12-291919-12-29
Electrical device for signal transmission
ExpiredFR527451A
(en)