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Inventions Exam Prep: Certification Test 706

helium MCQs App Download & PDF e-Book - 706

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MCQ: 706

The process to extract helium from natural gas was invented by

  1. Sir Henry Ruttan
  2. Sir John Cunningham McLennan
  3. Dr Larry wang
  4. Sir George Beers

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helium MCQs App (Android & iOS)

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