A WEEKLY pais SERIE S. es YORK, MAY 24, 1862. VOL. VI.---NO. 21. the edge of this head are six or seven holes cadintine dle by. the screws in the side of ihe: supriebt, The Improved Screw and Tapping Machines. from the center, which serve to hold the mills, cut- We wish that every mechanic in the…
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