| 摘要 |
PCT No. PCT/GB90/01206 Sec. 371 Date May 13, 1992 Sec. 102(e) Date May 13, 1992 PCT Filed Aug. 2, 1990 PCT Pub. No. WO91/03923 PCT Pub. Date Apr. 4, 1991.A bottom blade for a grass cutting unit is formed by bending a low carbon steel mounting plate to form a lip; welding to the lip a thin wear strip of high carbon steel and further bending the mounting plate to produce the required lip height. |
