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| All Patents in class 34/137 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,447,929 | Mar. 06, 1923 | G.B. Damon | Drier | ore processing apparatus | |
| 1,518,966 | Dec. 09, 1924 | G.B. Damon | Drier | ore processing apparatus | |