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| All Patents in class 33/501.17 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 643,080 | Feb. 06, 1900 | J. Boulet | Gear Tooth Calipers | |
| 1,512,626 | Oct. 21, 1924 | P.M. Mueller | Bench Type Gear Testing Machine | ||
| 1,536,734 | May 05, 1925 | H.D. Tanner | Bevel Gear Testing Device | ||
| 1,732,730 | Oct. 22, 1929 | R.W. Porter | Method and Apparatus for Measuring and Comparing Gears and the Like | ||
| 1,812,369 | Jun. 30, 1931 | R.O. Beardsley, R.W. Porter | Projecting Mechanism and Gear Staging Device | ||
 | 2,445,402 | Jul. 20, 1948 | B.V. Malmberg | Gear Testing Device | |