William Oughred invented which mathematical instrument in 1622?
Cursor (slide rule) Slipstick Cursor (slide rules) Slide rule Slide ruler Slide rules Slipsticks Addition Slide Rule Slide Rule Slide-rule Circular calculator Circular slide rule Sliderule SLIDE RULE
cursor slide rule slide rules slide rule sliderule cursor slide rules slipstick addition slide rule slipsticks circular calculator slide ruler circular slide rule
slide rule
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SLIDE RULE