The Fleming valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose Fleming as a detector for early radio receivers used in electromagnetic wireless telegraphy. It was the first practical vacuum tube and the first thermionic diode, a vacuum tube whose purpose is to conduct current in one direction and block current flowing in the opposite direction.
invented by Robert H. Goddard
A liquid-propellant rocket or liquid rocket utilizes a rocket engine that uses…
invented by Franz Fischer Hans Tropsch
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invented by J.W. Horton Warren Marrison
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invented by Xerox PARC
Produced at Xerox PARC by Butler Lampson, Charles Simonyi and colleagues.
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