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| All Patents in class 220/319 | |||||
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| Number | Date | Patentee | Title | Type | |
| 498,299 | May 30, 1893 | W.L. Mullins, T.W. Petway | Coffee Roaster | coffee roasters | |
| 2,021,241 | Nov. 19, 1935 | A.W. Mall | Quick detachable coupling | ||