| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| All Patents in class 340/870.23 | |||||
      | |||||
| Picture | Number | Date | Patentee | Title | |
| 299,552 | Jun. 03, 1884 | W.S. Johnson | Electro-Magnetic Indicator | ||
 | 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 | |