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Inventions MCQs – Certification Test 563

Gas Mask MCQ (Question 563) – App & e-Book Download

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MCQ 563: The first effective filtering gas mask was invented by an African American inventor named as:

  1. Sir Garrett Morgan
  2. Sir William Shockley
  3. John Loudon McAdam
  4. Sir Samuel Morse
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8th Class Science Test Questions

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