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| All Patents in class 241/207 | |||||
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| Number | Date | Patentee | Title | Type | |
| 24,350 | Jun. 07, 1859 | J.D. Custer | Machine for Tempering Clay | ||
| 2,556,641 | Jun. 12, 1951 | H.F. Bakewell | Grinder for pigments and other materials | ||