New Observatory. AN IMPROVED PUG MILL. New York as a Milling Center. Purification of Mercury. AN IMPROVED DRILL GRINDER. off is gauged by the left hand on the feed wheel handle. AN IMPROVED RAIL PUNCH. HITIME'S RAIL PUNCH. Mb 4 WOODCOCK'S PUG MILL. A TWIST DRILL GRINDER FOR GRINDING DRILLS FROM ONE-QUARTER INCH TO TWO INCHES DIAMETER., scientific american, 1888-09-22
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