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B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L1/00—Devices along the route controlled by interaction with the vehicle or train
B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
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FR395303D1908-04-151908-09-02
Warning device to warn any post of the debolt of the rails along the railway lines in the event of a criminal attack
ExpiredFR395303A
(en)