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Inventions MCQs – Certification Test 450

Letter Box MCQs (Question 450) – App & e-Book Download

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MCQ 450: In which one of the following year the first letter-box was patented by the U.S postal service?

  1. 1803
  2. 1833
  3. 1858
  4. 1847
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8th Class Science Test Questions

8th Class Science Quiz with Answers