|
GB1006393A
|
|
Improvements in or relating to pump valve inserts
|
|
GB1000955A
|
|
Lightweight drill pipe
|
|
US3066614A
|
|
Well swab
|
|
US3067593A
|
|
Integral tool joint drill pipe
|
|
GB882349A
|
|
Pump piston
|
|
US3092139A
|
|
Valve with means for controlling and indicating wear
|
|
GB864606A
|
|
Drill pipe coupling
|
|
US3054647A
|
|
Drill pipe coupling
|
|
US3074767A
|
|
Wear-resisting drill pipe coupling
|
|
GB893155A
|
|
Kelly bushing
|
|
US2987354A
|
|
Pump piston
|
|
US2987353A
|
|
Piston and piston ring
|
|
US2977165A
|
|
Slush pump piston snap ring insertion
|
|
GB857630A
|
|
Pipe connection
|
|
DE1093760B
|
|
Anchoring for the lower end of a tensioned pump riser in oil wells
|
|
GB907250A
|
|
Improvements in and relating to fluid control valves
|
|
US3026693A
|
|
Kelly bushing
|
|
US2992021A
|
|
Pipe connection
|
|
US2982355A
|
|
Pumping well apparatus
|
|
US2869405A
|
|
Trepanning head
|
