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| All Patents in class 250/208.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,803,448 | Aug. 20, 1957 | L.B. Biebel | Computing scale | ||
| 3,519,835 | Jul. 07, 1970 | J.R. Davies | Radiation sensitive apparatus for verifying label position | ||