CASSIER'S MAGAZINE 470 FIG. 3.— EVANS CONES, MADE BY GEORGE F. EVANS, BOSTON, MASS., U. S. A. … FIG. 4.— VARIABLE-SPEED GEAR, MADE BY THE POWER & SPEED REGULATOR MFG. CO., KALAMAZOO, MICH., U. S. A.
Engineering
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