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| All Patents in class 220/4.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 150,752 | May 12, 1874 | I. Dunham | Improvement in Cooking Utensils | roasters | |
| 274,538 | Mar. 27, 1883 | T.C. White | Coffee Roaster | coffee roasters | |
| 2,078,497 | Apr. 27, 1937 | H.L. Johnston | Food handling apparatus | ||
| 4,522,310 | Jun. 11, 1985 | W.T. Pagac, F. Mikic | Housing Holder and Cooperating Detachable Housing | ||