MAY i 1897. AN IMPROVED STEAM ENGINE. The Antiquity of the Steel Square. BLANCHARD'S DUPLEX STEAM ENGINE. Protective Spectacles for Workmen. RECENTLY PATENTED INVENTIONS. Mechanical. PREVENTING END MOTION IN SHAFTS Agricultural. Miscellaneous., scientific american, 1897-05-01
MAY i 1897. AN IMPROVED STEAM ENGINE. The Antiquity of the Steel Square. BLANCHARD'S DUPLEX STEAM ENGINE. Protective Spectacles for Workmen. RECENTLY PATENTED INVENTIONS. Mechanical. PREVENTING END MOTION IN SHAFTS Agricultural. Miscellaneous., scientific american, 1897-05-01
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