| 摘要 |
722,641. Pile wire blades. NEILL & CO., (SHEFFIELD), Ltd., J. Nov. 16, 1953 [Nov. 22, 1952], No. 29557/52. Class 142 (2). [Also in Group XXIII] A pile wire blade has its cutting edge formed with convex (as shown) or concave bevelled scallops 23, those on one side being staggered with respect to those on the other side, so that the edge 17 is wavy in both elevation and plan. The scallops may be symmetrical about their individual centre lines, or unsymmetrical as shown. |
