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| Patents for William P. Allen | |||||
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| Number | Date | Patentee | Title | Type | |
| 194,587 | Aug. 28, 1877 | J. Daniels | Improvement in attachments for carpenters' squares | squares | |
| 269,654 | Dec. 26, 1882 | A.B. Fisher | Device for Squaring, Rounding, and Filing Circular Saws | ||