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Inventions MCQs – Certification Test 361

WD-40 Trivia (Question 361) – App & eBook Download

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MCQ: 361

WD-40 was patented by

  1. Sir Nikolaus Otto
  2. Sir John Fitch
  3. Sir John Barber
  4. Sir Norn Larsen
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8th Class Science Test Questions

8th Class Science Quiz with Answers