been reduced to the requisite size it is flattened by drawing it from one reel and winding it upon another and passing it between a pair of pressure steel rollers. After this the flattened wire is next hardened and nature and object to the hardening and tempering, scientific american, 1862-08-16
been reduced to the requisite size it is flattened by drawing it from one reel and winding it upon another and passing it between a pair of pressure steel rollers. After this the flattened wire is next hardened and nature and object to the hardening and tempering, scientific american, 1862-08-16
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