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| All Patents in class 101/379 | |||||
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| Number | Date | Patentee | Title | Type | |
| 336,481 | Feb. 16, 1886 | T. Hall | Type-plate for type-writing machines | typewriters | |
| 2,176,071 | Oct. 17, 1939 | E.A. Hall | Collet Construction | collets and collet holders | |