| 摘要 |
1,248,480. Twist drills; soldering. HAWERA HARTMETALL-WERKZEUGFABRIK RAVENSBURG G.m.b.H. 3 Jan., 1969 [4 Jan., 1968], No. 518/69. Headings B3C and B3R. A twist drill comprises a hard metal tip 2 soldered to the shank 1, the members 1 and 2 being interconnected by dogs 13, 14, and axially aligned by conical surfaces 20, 29, on member 2 and conical surfaces 22, 35, on member 1. |
