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| All Patents in class 156/519 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,244,140 | Jun. 03, 1941 | H.F. Caldwell | Label attaching machine | ||
| 2,378,112 | Jun. 12, 1945 | H.B. Tuthill, H.F. Caldwell | Adjustable labeling device | ||
| 3,112,238 | Nov. 26, 1963 | H.F. Caldwell, J.R. Davies | Labeling machine | ||