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| All Patents in class 277/407 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,213,167 | Jan. 23, 1917 | A.M. Drake | Magnetic chuck and casing | magnetic chucks | |
| 2,881,015 | Apr. 07, 1959 | E.C. Wahl | Shaft Seal Means and Method | shaft seals | |
| 3,138,390 | Jun. 23, 1964 | H. Jensen | Rotary Seal With Annular Bead | shaft seals | |