73750220
Sep 6, 1988
Apr 11, 1989
POWER-OPERATED CUTTING TOOLS FOR CUTTING METAL TUBULAR MEMBERS IN A BORE HOLE; NAMELY CASING CUTTERS, TUBING CUTTERS, JUNK MILLS, PILOT MILLS, TAPERED MILLS, SECTION MILLS, ROTARY SHOES AND MULTIPLE STRING CUTTERS
Machinery