Inventions Practice Tests
Inventions Online Tests
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The MCQ: An Arab mathematician, who improved existing values for the length of the year and of the seasons was; "Length of Year and Seasons" App Download (Free) with answers: Sir Gideon Sundback; Sir Al Battani; Sir Mathew Maury; Sir Robert Bunsen; for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Apple eBook (Free Sample) for school certificate.
An Arab mathematician, who improved existing values for the length of the year and of the seasons was
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