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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 153
<^ H: i3 ^ Semaphore Arm for TelegraphBlock Signal. Two Position. … Semaphore Arm for TelegraphBlock Signal.Railroad engineering · Railroads
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
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