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| All Patents in class 377/17 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,416,968 | Mar. 04, 1947 | F. Turrettini | Stroboscopic Device for Determining Electrically the Position of an Object | ||
 | 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 | |
| 3,200,921 | Aug. 17, 1965 | J.C. Hollis | Controls for Machine Tools | ||
| 4,154,396 | May 15, 1979 | E.E. Kirkham | Digital Data Reader | ||