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| All Patents in class 340/870.23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 299,552 | Jun. 03, 1884 | W.S. Johnson | Electro-Magnetic Indicator | magnetic transducers | |
| 2,685,082 | Jul. 27, 1954 | W.D. Caldwell, W.W. Beman | Position Indicating Device | special purpose gauges | |
| 2,788,519 | Apr. 09, 1957 | W.D. Caldwell | Position Indicating Device | measurement gauges | |