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Who invented slide Rule and when?​
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Who invented slide Rule and when?​

User Gregomni
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A slide rule is used for multiplication and division, invented by William Oughtred in 1622. Used until 1970s. Straight up looks like a ruler.
User Dibery
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Invented by William Oughtred in the 1600s but only used in the mid 1800s
User Marc Fowler
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