US2976927A
|
|
Rotary drill bits and cutters
|
US2941785A
|
|
Expansible rotary drill bit
|
US2922627A
|
|
Rotary drill bits and cutters
|
US2822149A
|
|
Rotary expansible drill bits
|
US2758819A
|
|
Hydraulically expansible drill bits
|
US2814463A
|
|
Expansible drill bit with indicator
|
US2755071A
|
|
Apparatus for enlarging well bores
|
US2755070A
|
|
Hydraulically expansible rotary drill bits
|
US2719701A
|
|
Rotary expansible drill bits
|
US2754089A
|
|
Rotary expansible drill bits
|
US2754090A
|
|
Stage expansible rotary drill bits
|
US2754088A
|
|
Rotary expansible drill bits
|
US2710172A
|
|
Expansible drill bits for enlarging well bores
|
US2758820A
|
|
Expansible rotary drill bits
|
US2799477A
|
|
Expansible drill bits
|
US2719700A
|
|
Apparatus for enlarging well bores
|
CA857584A
|
|
Method of and apparatus for installing reinforcing members in boreholes
|
CA900951A
|
|
Expansible rotary drill bit with hydraulic lock
|
CA890739A
|
|
Method and apparatus for cementing casing sections in well bores
|
CA833328A
|
|
Apparatus for recovering formation wall samples from a bore hole
|