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| All Patents in class 99/606 | |||||
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| Number | Date | Patentee | Title | Type | |
| 341,324 | May 04, 1886 | E.C. Engelberg | Machine for hulling rice | ||
| 424,602 | Apr. 01, 1890 | E.C. Engelberg | Rice-hulling machine | ||
| 512,304 | Jan. 09, 1894 | C.E. Lipe | Hulling-machine | ||