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| All Patents in class 336/30 | |||||
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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 | |
| 2,937,577 | May 24, 1960 | J.M. Morgan, Jr. | Tracing Apparatus | profiling machines | |
| 3,079,548 | Feb. 26, 1963 | K.A. Robinson | Electromechanical Signalling Apparatus | machine tool controls | |