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| All Patents in class 403/223 | |||||
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| Number | Date | Patentee | Title | Type | |
| 777,215 | Dec. 13, 1904 | C.R. Meston | Shaft-coupling | industrial machine shaft couplings | |
| 2,154,651 | Apr. 18, 1939 | O.P. Wodack, H.M. Zschau | Tool retainer for portable power driven tools | drill chucks | |