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| All Patents in class 250/223R | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,485,339 | Dec. 23, 1969 | R.M. Henderson, L.E. Miller | Article Spacing System | electrical measuring apparatus | |
| 3,519,835 | Jul. 07, 1970 | J.R. Davies | Radiation sensitive apparatus for verifying label position | ||