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| All Patents in class 55/455 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,877,296 | Sep. 13, 1932 | M.J. Goldberg | Cleaning and Silencing Means for Engine Exhausts | exhaust mechanisms | |
| 2,813,597 | Nov. 19, 1957 | M.W. First | Multi-dust collectors | ||