| All Patents in class 235/70R |
Patents 1 -
15
of 16
      |
| Number | Date | Patentee | Title | Type |
| 2,907 | Jan. 10, 1843 | J.P. Smith | Merchant's Slide Rule | scales |
| 42,776 | May 17, 1864 | A. Jillson | Improvement in Sliding Scales for Steam Engines | rules |
| 71,979 | Dec. 10, 1867 | T. Carter | Improvement in Sawyers' Rules | rule graduations |
| 450,141 | Apr. 14, 1891 | J.A. Cook | Telescopic Rule | rules |
| 450,640 | Apr. 21, 1891 | R.C. Smith | Slide Rule for Logarithmic Calculations | slide rules |
| 571,366 | Nov. 17, 1896 | R. Hegarty | Measuring Pole | measuring rods |
| 613,684 | Nov. 08, 1898 | H. Kienast | Measuring Device | measurement gauges |
| 648,576 | May 01, 1900 | W.B. Taylor | Extensible Measuring Rule | measuring rods |
| 651,142 | Jun. 05, 1900 | W.L. Keuffel | Slide Rule | slide rules |
| 844,536 | Feb. 19, 1907 | H.U. Prindle | Extensible Rule and Calipers | extensible rules |
| 1,088,175 | Feb. 24, 1914 | W.O. Phillips | Slide Rule | slide rules |
| 1,145,042 | Jul. 06, 1915 | J.M. Spitzglass | Calculating Device | scales |
| 1,299,627 | Apr. 08, 1919 | H. Simon | Rule | folding rules |
| 1,391,621 | Sep. 20, 1921 | F.H. Fenwirth | Extension Rule | |
| 1,431,409 | Oct. 10, 1922 | W.L. Miller | Slide Rule | slide rules |
