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| All Patents in class 250/234 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,794,340 | Feb. 24, 1931 | M.K. Parkhurst | Optical Measuring Device | measurement gauges | |
| 1,919,200 | Jul. 25, 1933 | H.E. Childs | Headlight testing device | ||
| 2,703,505 | Mar. 08, 1955 | J.A. Senn | Apparatus for Aligning Machine Elements | milling machine accessories | |