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The Polygraph Multiple Choice Questions (MCQ Quiz) with Answers PDF (Polygraph MCQ PDF eBook) download to study Inventions Tests. Learn Inventions and Inventors Multiple Choice Questions and Answers (MCQs), Polygraph quiz answers PDF for online elementary school classes. The Polygraph MCQ App Download: Free Inventions App to study modern neuroscience, foot bag, post-it-note, a.c test prep for virtual online school.
The MCQ: In which one of the following year, Polygraph was patented; "Polygraph MCQs" App Download [Free] with answers: 1965, 1972, 1918, and 1921 for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Google eBook (Free Chapter) for school certificate.
In which one of the following year, Polygraph was patented?
Polygraph was discovered by
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