Inventions Practice Tests
Inventions Online Tests
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The MCQ: Metal detectors were invented by an American scientist and engineer named as; "Metal Detectors" App Download (Free) with answers: Sir Nikolaus Otto; Sir Schuyler Skaats Wheeler; Sir Alexander Graham Bell; Sir Oliver Evans; for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Google eBook (Free Sample) for school certificate.
Metal detectors were invented by an American scientist and engineer named as
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