| 摘要 |
896,572. Boring-tools. SIMMONDS, M. R. Aug. 17, 1959 [Aug. 18, 1958], No. 28007/59. Class 83 (3). [Also in Groups XXIII and XXV] A boring-tool comprises a tip 11<SP>1</SP>, Fig. 4, on an arm 11 which may be straight for fitting to a drill chuck, or be cranked and provided with a handle 15. The tip has a cutting edge 12, Fig. 6, at its end and upper and lower cutting edges 13, 14, Fig. 5. |
