THE NEW GUN BOAT GENERAL CONCHA OF THE SPANISH NAVY IMPROVED SASH BALANCE. N'anon ARNOLD'S SASH BALANCE. Men and Other Animals as Seed Carriers. The Sparrow Nuisance. Steam Whistles. NEW SPANISH WAR STEAMERS. IMPROVED SAFETY VALVE. Steel for Cutting Tools. GREGORY'S SAFETY VALVE., scientific american, 1883-09-29
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