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| All Patents in class 250/559.44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,375,665 | May 08, 1945 | M. Koulicovitch | Electric Devive for Signaling the Position of a Movable Mark | ||
| 3,519,835 | Jul. 07, 1970 | J.R. Davies | Radiation sensitive apparatus for verifying label position | ||