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| Patents for Bernard C. Day | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,443,895 | Jun. 22, 1948 | M.H. Arms, B.C. Day | Bevel gear holding fixture | grinders | |
| 2,535,199 | Dec. 26, 1950 | B.C. Day | Gear holding diaphragm chuck | grinders | |