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| All Patents in class 324/229 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,081,738 | May 25, 1937 | R.E. Conover | Sizing Device | grinding machines | |
| 2,083,759 | Jun. 15, 1937 | J.C. Temple | Mechanism for Sizing | grinding machines | |