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| Patents for Karel F. Henneman | |||||
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| Number | Date | Patentee | Title | Type | |
| 510,068 | Dec. 05, 1893 | K.F. Henneman | Gas Coffee Roaster | coffee roasters | |
| 550,999 | Dec. 10, 1895 | K.F. Henneman, G.C. Otten | Coffee Roaster | coffee roasters | |