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Helicopter: (double rotor) Heinrich Focke, Germany, 1936; (single rotor) Igor Sikorsky, U.S., 1939,Jet propulsion:(engine) Sir Frank Whittle, England, Hans von Ohain, Germany, 1936; (aircraft) Heinkel He 178, 1939 and Microscope:(compound) Zacharias Janssen, The Netherlands, 1590; (electron) Vladimir Zworykin et al., U.S., Canada, Germany, 1932-1939
Hope that helps
What else can I help you with?
When were dollars invented?
inventions , coins and paper money
What were the inventions through 1790-1860?
the first clock was invented.
What inventions did Benjamin Banneker?
Benjamin Banneker invented wooden watches
What inventions were made in 1793?
The cotton gin, invented by Eli Whitney.
What are some inventions made in 1863?
Blue Jeans were invented by Levi Strauss
What inventions were invented between years of 1996-2008?
what inventions were invented during the years 1996-2008?
What inventions were invented after the Wright Brothers invented the airplane?
bikes
What are some inventions from Switzerland?
there is no technology inventions in Switzerland but they invented the Swiss watch
What were the vikings inventions?
they invented the comb
What inventions were invented in 1852?
The Taco
What inventions did people use before the cell phone was invented?
inventions? light bulb
Where did Marie curie inventions invented?
She did her inventions in her "laboratory" which was an old rundown garden shed.
I ivvented 200 plus inventions. Who and where can I turn?
I have invented 200 plus inventions. Who and where can I turn?
Inventions in the future?
There are an infinite number of inventions that could be invented in the future. These inventions may include flying cars for example.
What inventions were invented between 1876-1900?
what was invented from 1867 -1900
What inventions were invented in the late 1900s?
Butter.
What medical inventions were invented in 1813?
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