Inventor
WALTERS D F
US4 patents
Patents
4 patentsUS4183416AJan 15, 1980
Cutter actuated rock bit lubrication system
DRESSER IND28 citations78
US4073548AFeb 14, 1978
Sealing system for a rotary rock bit
DRESSER IND25 citations78
US4597455AJul 1, 1986
Rock bit lubrication system
DRESSER IND21 citations77
US4330158AMay 18, 1982
Rotary rock bit with improved thrust flange
DRESSER IND9 citations70