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| Patents for Henry C. Hazard | |||||
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| Number | Date | Patentee | Title | Type | |
| 188,413 | Mar. 13, 1877 | C. Robinson | Clevis for Plows | clevises | |
| 201,837 | Mar. 26, 1878 | C. Robinson | Improvements in Plow-Clevises | clevises | |
| 250,587 | Dec. 06, 1881 | S.B. Shere | Bench Vise | bench vises | |
| 311,405 | Jan. 27, 1885 | S.S. Aughe | Plow Clevis | clevises | |
| RE12,287 | Nov. 22, 1904 | J. Johnston, J.C. Potter | Shaping Machine | ||