|
US4175224A
|
|
Apparatus for transporting heavy equipment on a pipeline
|
|
US4086803A
|
|
Pipe bending mandrel
|
|
US4151395A
|
|
Method and apparatus for electric arc and analogous welding under precision control
|
|
CA1006794A
|
|
Pipe bending system
|
|
US3974356A
|
|
Multiple arc welding device and method
|
|
US4005305A
|
|
Shielding apparatus
|
|
US3902575A
|
|
Protective braking means for precision mechanisms
|
|
US3860785A
|
|
Grounding device for electric welding
|
|
US3890905A
|
|
Apparatus for driving a device within a pipe
|
|
US3920171A
|
|
Apparatus for positioning and clamping pipes for welding
|
|
US3851519A
|
|
Internal pipe supporting mandrel
|
|
US3903391A
|
|
Oscillating apparatus for arc welding equipment
|
|
US3858026A
|
|
Method for internally welding pipe joints
|
|
US3844468A
|
|
Universal carriage apparatus for operating on pipes and analogous workpieces of various diameters
|
|
US3922517A
|
|
Welding method and apparatus
|
|
US3831684A
|
|
Earth working apparatus
|
|
GB1427329A
|
|
Welding process
|
|
US3834210A
|
|
Pipe bending system
|
|
US3840262A
|
|
Pipe sling
|
|
US3807715A
|
|
Method and apparatus for heat treating welded joints
|
