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| Patents for Henry W. Harper | |||||
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| Number | Date | Patentee | Title | Type | |
| 71,609 | Dec. 03, 1867 | H.W. Harper | Improvement in machines for dressing the frames of slates | sanding machines | |
| RE5,322 | Mar. 11, 1873 | J.W. Sayre, A.S. Shull | Dressing slate-frames | specialty woodworking machines | |