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| All Patents in class 220/327 | |||||
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| Number | Date | Patentee | Title | Type | |
| 510,300 | Dec. 05, 1893 | E.R. Stilwell | Feed-water-purifier attachment | feedwater apparatus | |
| 584,592 | Jun. 15, 1897 | E.E. Johnson | Piston-pump | ||
| 639,014 | Dec. 12, 1899 | W.A. Bradley | Device for Manipulating Tank Covers | covers | |
| 3,071,398 | Jan. 01, 1963 | J.A. Henning | Locking Ring | industrial machine mechanisms | |