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| All Patents in class 341/13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,685,082 | Jul. 27, 1954 | W.D. Caldwell, W.W. Beman | Position Indicating Device | special purpose gauges | |
| 2,694,804 | Nov. 16, 1954 | E.K. Wagner | Positioning Device | ||
| 2,993,279 | Jul. 25, 1961 | J.L. Bower | Photoelectric Gage | measurement gauges | |