|
US2940779A
|
|
Balanced face flange
|
|
US2726437A
|
|
Method of producing metal structures by welding
|
|
US2726438A
|
|
Method of pressure welding
|
|
US2650115A
|
|
Pipe coupling
|
|
US2549032A
|
|
Machine for and method of making spiral pipes
|
|
US2534185A
|
|
Method of and machine for making pipe fittings
|
|
US2465556A
|
|
Pipe fitting
|
|
US2435904A
|
|
Method of producing lined pipe bends
|
|
US2451587A
|
|
Pipe end and joint
|
|
US2242332A
|
|
Machine for producing pipe bends
|
|
US2297809A
|
|
Pipe bend machine
|
|
US2288753A
|
|
Machine for making pipe bends
|
|
US2014795A
|
|
Pipe fitting
|
|
US2008193A
|
|
Return bend
|
|
US1960788A
|
|
Method and means for forming pipe elbows
|
|
US1962510A
|
|
Method of and apparatus for forming tubular bends
|
|
US1962469A
|
|
Method of making pipe bends
|
