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| Patents for William O. Stark | |||||
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| Number | Date | Patentee | Title | Type | |
| 410,199 | Sep. 03, 1889 | J. Ross | Automatic balancing device for swing-saws | circular crosscut saws | |
| 415,055 | Nov. 12, 1889 | F.C. Olin | Steam Pump | steam pumps | |
| 426,511 | Apr. 29, 1890 | F.C. Olin | Steam Pump and Motor | steam pumps | |
| 443,107 | Dec. 23, 1890 | F.C. Olin | Balanced Govenor Valve | ||
| 450,141 | Apr. 14, 1891 | J.A. Cook | Telescopic Rule | rules | |