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| Patents for J. W. Ruger Mfg. Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 596,239 | Dec. 28, 1897 | J.B. Fenner | Gas Engine | ||
| 681,391 | Aug. 27, 1901 | J.B. Fenner | Muffler for Gas or Other Engines | mufflers | |
| 685,978 | Nov. 05, 1901 | J.B. Fenner | Electric Igniter for Gas Engines | ignition systems | |
| 705,058 | Jul. 22, 1902 | J.B. Fenner | Operating Mechanism for Gas Engine Valves, &c. | internal combustion engine valves | |
| 706,916 | Aug. 12, 1902 | J.B. Fenner | Fuel Valve for Gas Engines | internal combustion engine valves | |