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Inventions Exam Prep: Certification Test 142

Traffic light with three colours MCQs App Download & PDF e-Book - 142

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MCQ: 142

Which one of the following invents the traffic lights with three colors?

  1. Sir William Potts
  2. Dr Dennis Colonello
  3. Dr Larry wang
  4. Sir Norman Rolston
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Traffic light with three colours Exam Prep: Inventions App & eBook MCQs

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8th Class Science Test Questions

8th Class Science Quiz with Answers