Ballpoint pen
We all know just irritating it gets when a fountain pen leaks. To tackle this tendency to smudge, journalist and artist Laszlo Biro made it a point to come up with what we now call a ballpoint pen. He made this after he found an ink that could dry off immediately at a printing press. With help from George his brother who is a scientist, the ballpoint pen was manufactured in 1938.
Jet Engines
When World War 2 happened, jet engines had been manufactured, helping and giving fighters an advantageous edge when it comes to dealing with their adversaries. The German ME 262 is the first operational Jet fighter with the British Gloucester Meteor coming second. This technology was innovated initially in 1939 and 1945 saw them being used globe for commercial use as well.
Photocopying
An idea took over Chester “Chet” Carlson after learning about Thomas Edison and other famous inventors during his childhood. He always knew that offices had trouble to proofread things as he was working for a while. After working and much effort, by the year 1937, his kitchen experiments lead to the finding of xenocopy or photocopiers today.