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| Patents for Cox & Prentiss | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 407,577 | Jul. 23, 1889 | J.D. Cox, Jr. | Machine for back-clearing twist-drills | |
| 407,721 | Jul. 23, 1889 | J.D. Cox, Jr. | Machine for back-clearing twist-drills | ||
| 797,820 | Aug. 22, 1905 | E.C. Peck | Tool Holder | ||