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| Patents for David B. Fraser | |||||
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| Number | Date | Patentee | Title | Type | |
| 585,659 | Jul. 06, 1897 | C.H. Duehring | Coffee Roaster | coffee roasters | |
| 587,090 | Jul. 27, 1897 | D.B. Fraser | Coffee Roaster | coffee roasters | |
| 619,297 | Feb. 14, 1899 | D.B. Fraser | Apparatus for Cooling Roasted Coffee | coffee coolers | |
| 627,993 | Jul. 04, 1899 | D.B. Fraser | Coffee Roaster. | coffee roasters | |