METALLURGICAL INVENTION. Ore Grinding Mill. Railroad Spike Extractor. Sash Fastener and Holder. AGRICULTURAL INVENTION. A New Plow Attachment. ENGINEERING INVENTIONS. Condenser for Steam Engines. Superheater for Steam. MECHANICAL INVENTIONS. Expanding Mandrel. MISCELLANEOUS INVENTIONS. Shall Loop for Harness. Improved Cotton Whipper., scientific american, 1882-05-27

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