|
US1678963A
|
|
Mechanism for removing burrs from tubes
|
|
US1681017A
|
|
Lock
|
|
US1648829A
|
|
Flying shears
|
|
US1611875A
|
|
Welding apparatus
|
|
GB216473A
|
|
Improvements in tube-supporting and compressing devices for apparatus for welding tubing and the like
|
|
GB219043A
|
|
Improvements in and relating to electric welding machines
|
|
GB216203A
|
|
Improvements in and relating to electric welding
|
|
GB203781A
|
|
Improvements in electric butt-welding machines
|
|
US1498550A
|
|
Flying shears
|
|
US1435306A
|
|
Butt-welded thin-walled tubing
|
|
US1501782A
|
|
Apparatus for electrically butt-welding tubing
|
|
US1385369A
|
|
Control device for automatic machines
|
|
US1341299A
|
|
Furnace and lining therefor
|
|
US956499A
|
|
Tie-plate.
|
|
US958271A
|
|
Tie-plate.
|
|
US989321A
|
|
Tie-plate.
|
|
US947618A
|
|
Tie-plate.
|
|
US734300A
|
|
Tube-forming apparatus.
|
|
US734299A
|
|
Tube-forming apparatus.
|
|
CA226591A
|
|
Electric welding machine
|
