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Appletons' cyclopædia of technical drawing (1896)
Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 935
Safe Construction. v^--^ x--N^>>-N^ >^ N/S>^JVXi^^V^N?x^^ V->^ V^ N^ >,^->^>y^ N<i^ N>^V^rSl^>^^?>Jp?></^^^ ^ Cast-iron Tread. 57 882 SCRAPS. … J Feet Plan, Section, and Elevation of a Wooden Mantel and Fire-Place. SCRAPS. 883Mechanical drawing
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