Inventor:Robert; Henri F. A.
No. of patents:1
||Title Of Patent
||Rotary and reciprocating drilling machine
||August 29, 1989|
|The invention relates to a drilling machine comprising a kelly (5) suspended from a boom (3) mounted for pivoting on a chassis (1), a rotary table (7) through which the kelly is movable axially, drive members provided in the rotary table for rotating the kelly and a rotary drilling t|