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Well.. the purpose of the slide rule is that, to count, add, subtract, multiply, and divide. For as its structure is like a ruler and has a transparent slider. It is the type of a cursor, used for pointing out the numerals/ numbers. It is the third calculator invented, after Napier's bones. It was invented by Napier, as well.

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14y ago

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Q: What was the purpose of slide rule?
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