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| All Patents in class 415/217.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 878,256 | Feb. 04, 1908 | W.H. Thorne | Centrifugal Pump | rotary pumps | |
| 940,257 | Nov. 16, 1909 | C.V. Kerr | Centrifugal Pump | rotary pumps | |
| 2,814,540 | Nov. 26, 1957 | H.I. Southerwick | Piston Packing | ||
| 2,828,531 | Apr. 01, 1958 | C.J. Bath | Method of Making a Helicopter Blade | manufacturing processes | |