|
US4548280A
|
|
Drill bit having a failure indicator
|
|
US4542798A
|
|
Nozzle assembly for an earth boring drill bit
|
|
US4558754A
|
|
Drill bit having angled nozzles
|
|
US4611673A
|
|
Drill bit having offset roller cutters and improved nozzles
|
|
US4582149A
|
|
Drill bit having replaceable nozzles directing drilling fluid at a predetermined angle
|
|
US4556424A
|
|
Cermets having transformation-toughening properties and method of heat-treating to improve such properties
|
|
GB8324984D0
|
|
Friction bearing assembly for a roller cutter drill bit
|
|
US4495840A
|
|
Bit breaker
|
|
US4554986A
|
|
Rotary drill bit having drag cutting elements
|
|
US4444281A
|
|
Combination drag and roller cutter drill bit
|
|
EP0111600A1
|
|
Improvements in or relating to cutting tools
|
|
US4516642A
|
|
Drill bit having angled nozzles for improved bit and well bore cleaning
|
|
US4514097A
|
|
Friction bearing assembly having a series of rings constituting a bushing therefor
|
|
US4466622A
|
|
Compound dynamic seal for rolling cutter drill bit
|
|
GB2119036A
|
|
Dynamic seal for rolling cutter drill bit
|
|
US4657093A
|
|
Rolling cutter drill bit
|
|
CA1157606A
|
|
Methods of manufacturing gradient composite metallic structures and gradient composite metallic products
|
|
CA1182105A
|
|
Method of manufacturing large diameter oil well drilling bit and large diameter oil well drilling bit
|
|
CA1164448A
|
|
Thrust face bearing structure for rolling cutter drill bit
|
|
CA1163626A
|
|
Dynamic seal for rolling cutter drill bit
|
