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| All Patents in class 48/184 | |||||
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| Number | Date | Patentee | Title | Type | |
| 177,745 | May 23, 1876 | R.H. Plass | Improvement in gas-governors | ||
| 2,399,826 | May 07, 1946 | J.W. Ridgway | Diffuser | carburetors | |