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| All Patents in class 432/51 | |||||
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| Number | Date | Patentee | Title | Type | |
| 577,313 | Feb. 16, 1897 | J. McLean | Coffee Roaster | coffee roasters | |
| 2,346,923 | Apr. 18, 1944 | T.A. Waltz, A. Kullman | Apparatus for Flame Hardening Racks and the Like | heat treating machines | |