Inventions Practice Tests
Inventions Online Tests
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The MCQ: In which one of the following year, Polygraph was patented; "Polygraph" App Download (Free) with answers 1965, 1972, 1918 and 1921 for online certifications. Solve inventions and inventors quiz questions, download Google eBook (Free Sample) for online elementary school classes.
MCQ 1: In which one of the following year, Polygraph was patented?
MCQ 2: Polygraph was discovered by
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