Adding machine MCQs e-Book PDF | Inventions App Download
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The MCQ: In which one of the following year, adding machine was patented; "Adding machine" App Download [Free] with answers: 1642, 1657, 1643, and 1645 for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Apple Book (Free Sample) for school certificate.
In which one of the following year, adding machine was patented?
Adding machine was invented by
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