Ball operated J-slot

Device for releasably connecting well tools

Downhole clutch assembly

Downhole control tool

Emergency release device for connecting between tubular members

Gravel pack safety sub

Hydraulic release joint for tubing systems

Indexing apparatus

Indexing tool for use in earth borehole drilling and testing

Latch for well tools

Latch means for well tools and components

Mechanical lockout for pressure responsive downhole tool

Multiple indexing J-slot for model E SRO valve

Oil field converting axial force into torque

Orientation device, particularly for drilling tool or a well equ

Positioning tool

Pressure actuated cleaning tool

Pressure and friction reducing flow adapter

Right-hand on and right-hand off retrieving head

Short stroke casing valve with positioning and jetting tools the