Inventor
LE ROC H ROLAND
FR3 patents
Patents
3 patentsUS4567952AFeb 4, 1986
Process and apparatus for locking and releasing of a drilling shaft with essentially vertical axis
BRISSONNEAU & LOTZ52 citations90
US4585079AApr 29, 1986
Method and a machine for handling drill pipes
BRISSONNEAU & LOTZ15 citations71
US4545269AOct 8, 1985
Machine to apply a screwing or unscrewing torque
BRISSONNEAU & LOTZ8 citations71