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| All Patents in class 356/393 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,480,390 | Jan. 08, 1924 | J. Hartness | Apparatus for Inspecting and Gauging Screw Threads | ||
| 1,732,730 | Oct. 22, 1929 | R.W. Porter | Method and Apparatus for Measuring and Comparing Gears and the Like | ||
| 1,745,523 | Feb. 04, 1930 | R.O. Beardsley | Apparatus for Testing Taper Threaded Screws | ||