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| All Patents in class 417/501 | |||||
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| Number | Date | Patentee | Title | Type | |
| 909,183 | Jan. 12, 1909 | C.L. Heisler | Vacuum Pump | vacuum pumps | |
| 2,438,251 | Mar. 23, 1948 | T. Pedersen | Engine Fuel Supply Means | fuel injection apparatus | |