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| All Patents in class 428/522 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,097,096 | Oct. 26, 1937 | W.F. Groene | Top Feeding Mechanism for Lathes | metalworking machine mechanisms | |
| 4,784,894 | Nov. 15, 1988 | E.J. Hummelt, E.E. Kirkham, R. Johnstone | Molded polymer composite | ||