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| Patents for Cyrus Alger | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,483X | Mar. 30, 1811 | C. Alger | mode of casting large iron rollers for rolling iron | trade specific | |
| 2,136X | May 18, 1814 | C. Alger | Cast Iron Hinges | hinges | |
| 9,817X | Jul. 01, 1836 | C. Alger | Sheaves for blocks | ||