NEW DRAUGHTSMAN'S EASEL. NEW METHOD OF OPERATING MINING PUMPS. ow. Strong Hose Pipe. MECHANICAL INVENTIONS. IMPROVED DRAUGHTSMAN'S EASEL. The Little Snow Plow. Brown Stone as a Fire Resister. IMPROVED METHOD OF OPERATING PUMPS., scientific american, 1880-05-29
NEW DRAUGHTSMAN'S EASEL. NEW METHOD OF OPERATING MINING PUMPS. ow. Strong Hose Pipe. MECHANICAL INVENTIONS. IMPROVED DRAUGHTSMAN'S EASEL. The Little Snow Plow. Brown Stone as a Fire Resister. IMPROVED METHOD OF OPERATING PUMPS., scientific american, 1880-05-29
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