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The MCQ: Electron tubes were invented by; "Electron Tubes MCQs" App Download [Free] with answers: sir henry w. seelay, sir schuyler skaats wheeler, sir samuel w. francis, and sir john ambrose for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Apple Book (Free Chapter) for school certificate.
Electron tubes were invented by
The first vacuum tube was invented by an English electrical engineer in
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