Class 8 MCQs From Inventions Textbook

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Inventions Competitive Exam: Certification Test 568

Seismograph Quiz App & e-Book: MCQ 568

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MCQ: 568

First modern seismograph was patented by

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

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