All Patents of Type: slide rules |
Patents 1 -
7
of 7
|
Number | Date | Patentee | Title | Type |
NS-13 | Jul. 12, 1851 | A. Chisholm | Mathematical mechanical scale to solve problems in trigonometry | scales |
249,117 | Nov. 01, 1881 | E. Thacher | Slide Rule | cylindrical slide rules |
450,640 | Apr. 21, 1891 | R.C. Smith | Slide Rule for Logarithmic Calculations | slide rules |
540,184 | May 28, 1895 | T. Norris | Markre for Slide Rules | cursors |
557,246 | Mar. 31, 1896 | G.F. Wynne | Photographic Exposure Meter | special purpose slide rules |
1,145,042 | Jul. 06, 1915 | J.M. Spitzglass | Calculating Device | scales |
1,934,232 | Nov. 07, 1933 | A.W. Keuffel | Slide rule | slide rules |