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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
B61L5/12—Visible signals
B61L5/14—Form signals, e.g. semaphore arms
B61L5/16—Local operating mechanisms for form signals
B61L5/166—Local operating mechanisms for form signals using electrically controlled gravity operated driving means
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FR411067D1909-10-301909-10-30Signal électrique pour chemins de fer
ExpiredFR411067A
(fr)