|
US2925573A
|
|
Weight indicators
|
|
US2960861A
|
|
Fluid density and viscosity meter system
|
|
US2947361A
|
|
Retrievable tester for oil wells
|
|
US2961046A
|
|
Feeding and counting system for injecting balls into a flow stream
|
|
US2911187A
|
|
High pressure plug valve
|
|
US2883874A
|
|
Heavy duty pump
|
|
US2961047A
|
|
Tubing latch
|
|
US2961045A
|
|
Assembly for injecting balls into a flow stream for use in connection with oil wells
|
|
US2955654A
|
|
Barrel assembly for use in fracturing oil wells
|
|
US2968915A
|
|
Hydraulic mechanism for concrete mixer
|
|
US2929729A
|
|
Compositions and methods useful in preparing cement slurries
|
|
US2846015A
|
|
Self fill differential collar
|
|
US2913053A
|
|
Formation cleaner
|
|
US2925865A
|
|
Full flow packer cementing shoe
|
|
US2850329A
|
|
Pneumatically operated system
|
|
US2922478A
|
|
Well packer
|
|
US2806539A
|
|
Well tester
|
|
US2837163A
|
|
Selective plugging of underground well strata
|
|
US2815815A
|
|
Method of controlling loose sand
|
|
US2795856A
|
|
Control mechanism for elements in well tools
|
