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| Patents for Earl F. Pierce | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,301,891 | Apr. 29, 1919 | F.O. Albertson | Valve Refacing Tool | valve grinding tools | |
| 1,362,790 | Dec. 21, 1920 | F. Hardinge | Gear mechanism for lathes | metal lathes | |
| 1,497,109 | Jun. 10, 1924 | J.L. McCormack | Screw thread cutting machine | metal threading machines | |