Drilling apparatus mounted on a self-propelled base equipped with a joint to permit use on uneven terrain and drilling at various angles with respect to the terrain surface; embodiments of the invention feature suction apparatus for removing drill cuttings, and foldable masts.
申请公布号
US4126193(A)
申请公布日期
1978.11.21
申请号
US19760668439
申请日期
1976.03.19
申请人
BROWN, DECEASED, CICERO C.;BROWN, EXECUTOR, BY JOE R.
发明人
BROWN, DECEASED, CICERO C.;BROWN, EXECUTOR, BY JOE R.
