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Inventions MCQs – Certification Test 162

Signaling system MCQs (Question 162) – App & e-Book Download

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MCQ 162: Pyrotechnic signaling system was patented by:

  1. Sir Martha Coston
  2. Sir Walter Brattain
  3. Sir T.J Blachut
  4. Sir Walter Wingfield
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8th Class Science Test Questions

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