| 摘要 |
1535239 Drilling machines; feeding K & V SORENSEN ENG Ltd 27 Feb 1976 [5 March 1975] 07836/76 Headings B3C and B3B [Also in Division F1] A drilling machine is substantially as described in Specification 1,535,238 but the claims are directed to the means for feeding the drill head-namely air cylinder 2, hydraulic dashpot cylinder 3, Fig. 1, and the controlling valve circuit of Figs. 3 and 4, not shown. |
