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| Patents for Mary E. Hamer | |||||
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| Picture | Number | Date | Patentee | Title | |
| 617,940 | Jan. 17, 1899 | W.D. Rowland | Buffing and polishing machine for shovel-handles | ||
| 644,191 | Feb. 27, 1900 | A.W. Stauffer | Carpenter's Plane | ||
 | 649,011 | May 08, 1900 | J. Szafka | Surface Gage | |