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| All Patents in class 285/321 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,943,980 | Jan. 16, 1934 | A.W. Mall | Spindle connecter | ||
| 3,071,398 | Jan. 01, 1963 | J.A. Henning | Locking Ring | industrial machine mechanisms | |