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Inventions MCQs – Certification Test 362

Electron Tubes MCQs (Question 362) – App & e-Book Download

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MCQ 362: Electron tubes were invented by:

  1. Sir Henry W. Seelay
  2. Sir Schuyler Skaats Wheeler
  3. Sir Samuel W. Francis
  4. Sir John Ambrose
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Inventions MCQs App & e-Book – Electron Tubes Study Guide

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8th Class Science Test Questions

8th Class Science Quiz with Answers