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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Robert; Henri F. A.
Address:
Herblay, FR
No. of patents:
1
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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