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| Patents for Isaac Williams | |||||
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| Number | Date | Patentee | Title | Type | |
| 80,691 | Aug. 04, 1868 | I. Williams | Improvement in Weather-Board Gage and Rest | clapboard markers | |
| 80,692 | Aug. 04, 1868 | I. Williams | Improvement in Gages for Weather-Boarding | measuring rods | |