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Publication of NL774CpublicationCriticalpatent/NL774C/nl
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
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
NL3369A1912-10-261913-09-25Verbetering aan een schokdemper voor seinvleugels
NL774C
(nl)