|
US3689199A
|
|
Air pressure intensifier
|
|
US3162251A
|
|
Enclosed case mud percussion tool
|
|
US2756966A
|
|
Fluid actuated impact tool
|
|
US2756723A
|
|
Fluid actuated impact tool
|
|
US2764130A
|
|
Fluid actuated impact tool
|
|
GB713052A
|
|
Improvements in or relating to fluid actuated impact tools
|
|
US2758817A
|
|
Percussion tools for wells
|
|
US2665115A
|
|
Percussion tool for wells
|
|
US2584979A
|
|
Percussion tool
|
|
US2584978A
|
|
Percussion tool
|
|
US2645207A
|
|
Percussion drilling tool
|
|
US2619324A
|
|
Percussion tool for wells
|
|
US2507585A
|
|
Percussion tool for wells
|
|
US2346721A
|
|
Density determining device
|
|
US2344121A
|
|
Releasable setting tool and by-pass
|
|
US2331532A
|
|
Well plug
|
|
US2355199A
|
|
Well plug
|
|
US2317021A
|
|
By-pass and releasing means
|
|
US2230447A
|
|
Well plug
|
