a Inventions  b

Frozen Food: In 1923, Clarence Birdseye invented and later perfected a system of packing fresh food into waxed cardboard boxes and flash-freezing under high pressure.

Television: John Logie Baird invented the mechanical television system. In the 1920’s he patented the idea of using arrays of transparent rods to transmit images  for television  and facsimiles.

Bubble Gum: In 1928 Walter E. Diemer invented bubble gum.

Car Radio: In 1929 Paul Galvin, the head of Galvin Manufacturing Corporation invented the first car radio.

Penicillin: Invented in 1928, penicillin was one of the first antidotes ever made, Scientist Sir Alexander Flemington.

Lie Detector: The lie detector was invented by John A. Larson in 1921. It would measure heartbeats and breathing to learn if a person lying or not.

Band-Aid: Made Earle Dickson in 1920

Bulldozer: Engineer Benjamin Holt built a crawling tractor which he called the caterpillar in 1885. Later, scraping blades were attached and in 1923, Laplant-Choate Manufacturing Company produced the first bulldozer.