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Inventions MCQs – Certification Test 87

Half Tone Engraving MCQ (Question 87) – Learning App & e-Book Download

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MCQ 87: In which one of the following year, half tone engraving was patented?

  1. 1806
  2. 1857
  3. 1869
  4. 1813
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8th Class Science Test Questions

8th Class Science Quiz with Answers