Polygraph MCQ App Download | Inventions e-Book PDF
Inventions Practice Test: MCQs for Exam Prep
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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 eBook (Free Sample) for school certificate.
In which one of the following year, Polygraph was patented?
Polygraph was discovered by
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