|
US2564372A
|
|
Flanged article
|
|
US2481219A
|
|
Electric welding
|
|
US2497516A
|
|
Electrical winding
|
|
US2385160A
|
|
Finishing welded article
|
|
US2396002A
|
|
Welder
|
|
US2306050A
|
|
Arc welding
|
|
US2241216A
|
|
Welding
|
|
US2157904A
|
|
Boiler furnace wall and part therefor
|
|
US2173690A
|
|
Furnace floor
|
|
US2154448A
|
|
Method of production of certain tubular units
|
|
US2181201A
|
|
Method of making hollow articles
|
|
US2105132A
|
|
Torque arm and similar structural member
|
|
US2131889A
|
|
Pedal
|
|
US2113891A
|
|
Stoker furnace
|
|
US2169843A
|
|
Boiler
|
|
US2149696A
|
|
Method of making heat exchangers
|
|
US2220579A
|
|
Method of making boiler tubes and the like
|
|
GB424329A
|
|
Improvements in or relating to heat conducting tubes
|
|
GB424063A
|
|
Improvements in or relating to heat conducting tubes
|
|
US1971173A
|
|
Heating and cooling apparatus
|
