Miller Electric Mfg. Co. was incorporated in 1935. The next year, Al Mulder, Miller's sole engineer, invented the world's first high frequency-stabilized AC industrial welder. This improved the quality of the welding arc, making AC welding practical for use in factories and construction.
Noteworthy Inventions of the 1930s
1930: Clarence Birdseye patents his frozen food process and 3M engineer Richard Drew patents Scotch tape.
1938: Patent attorney and physicist Chester Carlson invented the process that would eventually be named Xerography (“dry copy”).
1939: Air and land travel take legendary leaps. Igor Sikorsky invents the first successful helicopter.