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Manual of recommended practice for railway engineering and maintenance of way (1905)
American Railway Engineering and Maintenance-of-Way Association · Chicago, Ill. : The Association · leaf 155
144 SIGNALING AND INTERLOCKING. DETAIL OF SEMAPHORE ARM CASTING. … riG. 7. SIGNALING AND INTERLOCKING. 145Railroad engineering · Railroads
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
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