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| All Patents in class 451/337 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,665,084 | Apr. 03, 1928 | J.E. Caster | Grinding Machinery | grinding machines | |
| 1,893,566 | Jan. 10, 1933 | P.A. Solem, D.J. McLaughlin | Hopper feed for endless bed machines | woodworking machine stockfeeding mechanisms | |