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| All Patents in class 261/30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 82,786 | Oct. 06, 1868 | N.W. Bancroft | Improved gas-machine | ||
| 1,922,749 | Aug. 15, 1933 | L. Roush | Cream whipping apparatus | dairy machinery | |