Traveling Wave Tube
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University of Birmingham - Birmingham, England. In November 1943 Rudolf Kompfner first demonstrated amplification of radio frequency signals with a traveling wave tube. The device made possible important advances in telecommunications technology. Travelling wave tubes lay at the heart of telecom satellites like Telstar and other systems.
A decade earlier, Andrei Haeff as a research fellow at California Institute of Technology, was working on what would in 1933 be his discovery of a traveling-wave tube device. The IEEE has a link to an interesting story on the matter https://ieeexplore.ieee.org/document/7226611
