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| All Patents in class 181/269 | |||||
| Picture | Number | Date | Patentee | Title | |
| 542,124 | Jul. 02, 1895 | J.A. Drake, A.J. Drake, J.E. Weyman | Gas or Other Like Motor | ||
| 593,970 | Nov. 16, 1897 | C.A. Schwarm | Muffler for Gas Engines | ||
| 1,877,296 | Sep. 13, 1932 | M.J. Goldberg | Cleaning and Silencing Means for Engine Exhausts | ||