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| All Patents in class 34/233 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 56,861 | Jul. 31, 1866 | P. Plant | Coffee Roaster | ||
| 61,393 | Jan. 22, 1867 | J. Burns | Grain Dryer | ||
| 270,503 | Jan. 09, 1883 | J.J. Stopple | Coffee Roaster | ||
| 591,307 | Oct. 05, 1897 | B. Tupholme | Apparatus for Roasting Coffee | ||
| 619,297 | Feb. 14, 1899 | D.B. Fraser | Apparatus for Cooling Roasted Coffee | ||
 | 2,346,500 | Apr. 11, 1944 | R.C. Moore | Drying method and apparatus | |
 | 4,065,249 | Dec. 27, 1977 | J.W. Nelson | Heater for billets | |