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| All Patents in class 123/198E | |||||
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| Number | Date | Patentee | Title | Type | |
| 599,375 | Feb. 22, 1898 | W.E. White | Gas Engine | gas and gasoline engines | |
| 2,123,358 | Jul. 12, 1938 | F.P. Grutzner | Engine Silencing Hood | mufflers | |
| 2,838,129 | Jun. 10, 1958 | P. Walzak, A. Hesse | Muffler assembly | ||