| 摘要 |
<p>1505531 Rope-like cutting elements P TREFFNER and C TREFFNER 14 Feb 1975 [27 Feb 1974] 6475/75 Heading DIT [Also in Division B5] A cutting element is constructed by twisting a strip of electrically-resistive alloy so that the handedness of the twist changes uniformly along the wire e.g. at a point 66. The element is used for cutting polyurethane-foam blocks. The surface of the ribbon may have been roughened, for example by a rolling or cutting action, or by means of grit or other particles along its length.</p> |
