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| All Patents in class 340/672 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,040,378 | Oct. 08, 1912 | W.L. Miller | Electric Signaling System | ||
 | 2,685,082 | Jul. 27, 1954 | W.D. Caldwell, W.W. Beman | Position Indicating Device | |
 | 2,788,519 | Apr. 09, 1957 | W.D. Caldwell | Position Indicating Device | |