|
US3071828A
|
|
Apparatus for purifying air
|
|
US2199830A
|
|
Punch, die, and press assembly
|
|
US2238212A
|
|
Method and apparatus for producing lateral-provided fittings
|
|
US2238038A
|
|
Process of producing lateralprovided fittings
|
|
US2244054A
|
|
Pressure-tight bearing
|
|
US2256879A
|
|
Welding device
|
|
US2210141A
|
|
Method of providing nonradial tubular openings in arcuate surfaces
|
|
US2252064A
|
|
Heat exchange unit and system
|
|
US2229639A
|
|
Method of producing annuli
|
|
US2249346A
|
|
Steam heating system and control means therefor
|
|
US2220754A
|
|
Steam heating system with steam powered air circulation means
|
|
US2218700A
|
|
Air release valve
|
|
US2246033A
|
|
Turbine control valve
|
|
US2254566A
|
|
Flexible coupling
|
|
US2236564A
|
|
Pressure relief valve
|
|
US2263206A
|
|
Burnishing machine
|
|
US2220066A
|
|
Liquid fuel burner unit
|
|
US2235697A
|
|
Thermostat
|
|
US2206741A
|
|
Mechanico-fluid-pressure method of producing lateral-provided fittings
|
|
US2253110A
|
|
Self-compensating bearing
|
