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All Patents of Type: slide rules
Patents 1 - 4 of 4
First set of recordsLast set of records
651,142Jun. 05, 1900W.L. KeuffelSlide Ruleslide rules
1,150,771Aug. 17, 1915W.L. KeuffelSlide rule runnerslide rules
1,181,672May 02, 1916W.L. KeuffelSlide rule runnerslide rules
1,431,409Oct. 10, 1922W.L. MillerSlide Ruleslide rules
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