slide rule ( synonym found)
Definition of slide rule:

(n) : an analog calculator consisting of three interlocking strips marked with logarithmic scales, such that multiplication, division etc. can be performed by the equilavent of addition and subtraction
Definition of slide rule:

(n) : an analog calculator consisting of three interlocking strips marked with logarithmic scales, such that multiplication, division etc. can be performed by the equilavent of addition and subtraction
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