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| All Patents in class 235/84 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 540,184 | May 28, 1895 | T. Norris | Markre for Slide Rules | ||
| 845,463 | Feb. 26, 1907 | H.T. Hincks | Slide Rule | ||
| 2,277,643 | Mar. 24, 1942 | M.P. Holmes | Speed Controlling Mechanism | ||
| 2,289,110 | Jul. 07, 1942 | R.D. Wortendyke, H. Ernst | Milling Speed Calculator | ||
| 2,331,967 | Oct. 19, 1943 | R.D. Wortendyke, H. Ernst | Calculating Device | ||
| 2,492,229 | Dec. 27, 1949 | H.C. Kemper, R.K. Le Blond | Indicating Dial | ||