Improved Switch for Railroads. Convex and Concave Mirrors. TIIR STRAIT'S N-TABLE AND HAND AND STEAM SWITCH FOR RAILROADS., scientific american, 1871-07-01
Improved Switch for Railroads. Convex and Concave Mirrors. TIIR STRAIT'S N-TABLE AND HAND AND STEAM SWITCH FOR RAILROADS., scientific american, 1871-07-01
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