Inventions Practice Tests
Inventions Online Tests
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The MCQ: In which one of the following year mechanical calculators were invented; "Calculators" App Download (Free) with answers: 1656; 1665; 1642; 1675; for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Google eBook (Free Sample) for school certificate.
The first mechanical calculator was invented by
In which one of the following year mechanical calculators were invented?
In which country the first mechanical calculator was invented?
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