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| All Patents in class 226/157 | |||||
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| Number | Date | Patentee | Title | Type | |
| 447,017 | Feb. 24, 1891 | C.M. Spencer | Screw Machine | screw machines | |
| 1,260,305 | Mar. 26, 1918 | J.R. Blakeslee | Feed Mechanism | workpiece changers and storage mechanisms | |