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| All Patents in class 310/25 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,240,184 | Apr. 29, 1941 | C.M. Hathaway | Electric Gauge | ||
| 2,428,234 | Sep. 30, 1947 | A.G. Mapp | Internal Micrometer | micrometers | |
| 2,622,128 | Dec. 16, 1952 | P.E. Chapman | Growler type testing device | electrical devices | |