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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
B61L5/10—Locking mechanisms for points; Means for indicating the setting of points
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Engineering & Computer Science
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FR404863D1909-07-081909-07-08
Improvements in self-locking railroad needles
ExpiredFR404863A
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