Polygraph MCQ App Download - Inventions PDF e-Book
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 elementary school classes. Solve Inventions and Inventors Quiz Questions, download Google e-Book (Free Sample) for school certificate.
In which one of the following year, Polygraph was patented?
Polygraph was discovered by
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