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| All Patents in class 101/401 | |||||
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| Number | Date | Patentee | Title | Type | |
| 183,051 | Oct. 10, 1876 | E.A. Hart | Graining Rollers | graining tools | |
| 2,176,071 | Oct. 17, 1939 | E.A. Hall | Collet Construction | collets and collet holders | |