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Polygraph e-Book PDF | Inventions Study App Download

Inventions Admission Tests: Certification Test 183

Polygraph MCQ App Download & e-Book - 183

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MCQ: 183

In which one of the following year, Polygraph was patented?

  1. 1965
  2. 1972
  3. 1918
  4. 1921

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Polygraph Admission Tests: Inventions App & eBook MCQ

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