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All Patents of Type: slide rules
Patents 1 - 12 of 12
First set of recordsLast set of records
NumberDatePatenteeTitleType
2,907Jan. 10, 1843J.P. SmithMerchant's Slide Rulescales
NS-13Jul. 12, 1851A. ChisholmMathematical mechanical scale to solve problems in trigonometryscales
651,142Jun. 05, 1900W.L. KeuffelSlide Ruleslide rules
838,696Dec. 18, 1906W.F. DohertyEngineer's Slide Ruleslide rules
845,463Feb. 26, 1907H.T. HincksSlide Rulecircular slide rules
1,088,175Feb. 24, 1914W.O. PhillipsSlide Ruleslide 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
1,816,548Jul. 28, 1931L. RobidouxSimplified Rule (Fractional markings to 64's)scales
1,934,232Nov. 07, 1933A.W. KeuffelSlide ruleslide rules
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