jan 1, 1930 - Scotch tape patented by 3M engineer, Richard G. Drew.
The frozen food process patented by Clarence Birdseye.
Wallace Carothers and DuPont Labs invents neoprene.
The "differential analyzer", or analog computer invented by Vannevar Bush at MIT in Boston.
Frank Whittle and Dr Hans von Ohain both invent a jet engine.