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| All Patents in class 198/721 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,263,499 | Nov. 18, 1941 | F. Huber | Exhaust Box Conveyer | ||
| 3,129,823 | Apr. 21, 1964 | G.A. Bilocq | Centering mechanism for paper rolls and the like | ||