CLELLAND'S REVOLVING HARROW. Exporting American Locomotives. Cementing Brass on Glass. Action of Copper upon the Human Economy. IMPROVED SAFETY SWITCH GUARD. Five New Comets. IMPROVED FOOT POWER HAMMER. PAINTER'S FOOT POWER HAMMER. Drilling and Turning Glass. 4 041. IMPROVED SAFETY SWITCH GUARD., scientific american, 1884-03-01
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