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All Patents of Type: slide rules
Patents 1 - 7 of 7
First set of recordsLast set of records
2,907Jan. 10, 1843J.P. SmithMerchant's Slide Rulescales
651,142Jun. 05, 1900W.L. KeuffelSlide Ruleslide rules
845,463Feb. 26, 1907H.T. HincksSlide Rulecircular slide rules
1,150,771Aug. 17, 1915W.L. KeuffelSlide rule runnerslide rules
1,181,672May 02, 1916W.L. KeuffelSlide rule runnerslide rules
1,404,450Jan. 24, 1922G.A. LoflandDirect Reading Proportional Scalescales
1,431,409Oct. 10, 1922W.L. MillerSlide Ruleslide rules
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