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All Patents of Type: slide rules
Patents 1 - 5 of 5
First set of recordsLast set of records
NumberDatePatenteeTitleType
249,117Nov. 01, 1881E. ThacherSlide Rulecylindrical slide rules
450,640Apr. 21, 1891R.C. SmithSlide Rule for Logarithmic Calculationsslide rules
540,184May 28, 1895T. NorrisMarkre for Slide Rulescursors
557,246Mar. 31, 1896G.F. WynnePhotographic Exposure Meterspecial purpose slide rules
1,145,042Jul. 06, 1915J.M. SpitzglassCalculating Devicescales
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