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ANDRE DAUPHIN
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ANDRE DAUPHIN
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Publication of FR522523ApublicationCriticalpatent/FR522523A/en
B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
B61L5/20—Audible signals, e.g. detonator audible signalling
B61L5/22—Devices for initiating the release of detonators in a certain position of a signal
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Engineering & Computer Science
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Mechanical Engineering
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FR522523A1920-04-301920-04-30
Signal repeater for railway
ExpiredFR522523A
(en)