AN IMPROVED ARMATURE FOR ELECTRIC MACHINES. AN IMPROVED SEWING MACHINE. WRAY'S ARMATURE FOR ELECTRIC MACHINES. THE COLES DOUBLE-FEED SEWING MACHINE, scientific american, 1890-03-29
AN IMPROVED ARMATURE FOR ELECTRIC MACHINES. AN IMPROVED SEWING MACHINE. WRAY'S ARMATURE FOR ELECTRIC MACHINES. THE COLES DOUBLE-FEED SEWING MACHINE, scientific american, 1890-03-29
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