Were there any inventions in the 1930s-1940s?

Were there any inventions in the 1930s-1940s?
There were many inventions in this time period.
Here is a time line of some of the inventions

1930-
Scotch tape patented by Richard G. Drew
Jet engine invented by Frank Whittle and Dr Hans von Ohain
Analog computer invented by Vannevar Bush
Frozen food process patented by Clarence Birdseye
Wallace Carothers invents first synthetic rubber

1931-
Stop-action photography invented by Harold Edgerton
Electron microscope invented by Germans Max Knott and Ernst Ruska
Electric Razor invented by Jacob Schick
Aerosal Can invented by Erik Rotheim

1932-
Polaroid photography invented by Edwin Herbert
Zoom lens invented
Light meter invented
First parking meter invented by Carl C. Magee
Radio telescope invented by Karl Jansky

1933-
FM Radio invented by Edwin Howard Armstrong
First Drive in Movie made by Richard Hollingshead
First can or "metal beverage" by American Can Co.


1934-
Road reflectors invented by Percy Shaw
Monopoly invented by Charles Darrow
First magnetic recorder invented by Joseph Begun
Television invented by Philo Farnsworth
First laundromat by J.F. Cantrell

1935-
Nylon invented by Wallace Carothers
First canned beer made
First Helicopter in US by by Igor I. Sikorsky
First aircraft radar by Robert Watson
Toyota Cars launched in Japan

1936-
Voice recognition machine made by Bell Labs
Colt revolver patented by Samuel Colt
Sunscreen made by Eugene Schueller
Helicopter in Germany by Heinrich Focke
First Zippo Lighter by Zippo Manufacturing

1937-
Photocopier by Chester F. Carlson
First jet engine is built


1938-
Ballpoint pen invented by Ladislo Biro
Freeze-dried coffee is invented
Teflon invented by Roy J. Plunkett
LSD synthesized by Albert Hofmann
Strobe lighting is first invented

1939-
Frequency Modulation used by Edwin H. Armstrong
Hewlitt Packard is formed
First air conditioned car goes on show

1940-
Color television invented by CBS researchers led by Peter Goldmark
The Jeep invented by Karl Pabst
Morton Salt introduced to the food market
Synthetic tooth fillings developed

1941-
neutronic reactor invented by Enrico Fermi
first Superman movie debuted
First disposable aerosal cans by Lyle Goodhue and W. N. Sullivan

1942-
Electronic Digital Computer invented by John Vincent Atanasoff
First Turboprop engine developed

1943-
The Slinky inveted by Richard and Betty James
Silly Putty invented by James Wright

1944-
Mark I computer built by Howard Aiken

1945-
First atomic bomb tested in New Mexico
Grand Rapids began fluoridation of water


1946-
The Microwave Oven made by Dr. Percy Spencer
Magic 8-Ball toy invented by Alabe Toy Company
First electric blanket manufactured

1947-
Tupperware invented by Earl Tupper
Elmer's Glue is first introduced
Buckminister Fuller builds his first geodesic dome

1948-
Velcro by George de Mestral
The Frisbee by Walter Frederick Morrison and Warren Franscioni
Scrabble created by Alfred Mosher Butts
Holography invented by Dennis Gabor
Polaroid Land Camera invented by Edwin Land

1949-
Airfix Model Kits made by Nicholas Kove
Cluedo created by Anthony E. Pratt
First atomic clock by Harold Lyons


There are many more firsts and inventions of this time period.