Graduating Plane Stock. Improved Self-guiding Gage. A Patent Sold for a Large Sum. EVANS'S PATENT GRADUATING CIRCULAR PLANE STOCK., scientific american, 1865-12-16
Graduating Plane Stock. Improved Self-guiding Gage. A Patent Sold for a Large Sum. EVANS'S PATENT GRADUATING CIRCULAR PLANE STOCK., scientific american, 1865-12-16
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