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Robert; Henri F. A.
Herblay, FR
No. of patents:

Patent Number Title Of Patent Date Issued
4860837 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

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