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| Patents for John E. Caster | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,033,324 | Mar. 10, 1936 | L.F. Nenninger, J.E. Caster | Process of Grinding | grinding machines | |
| 2,063,659 | Dec. 08, 1936 | C. Booth, J.E. Caster | Internal Grinding Fixture | grinding machines | |