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| All Patents in class 55/417 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 397,048 | Jan. 29, 1889 | E. Bretney | Dust-collector | |
 | 408,074 | Jul. 30, 1889 | E. Bretney | Dust-collector | |
 | 438,523 | Oct. 14, 1890 | E. Bretney | Dust-collector | |
| 591,307 | Oct. 05, 1897 | B. Tupholme | Apparatus for Roasting Coffee | ||
 | 1,762,385 | Jun. 10, 1930 | R.L. Clark, C.T. Craker | Combined separator and trap assembly | |
 | 2,113,447 | Apr. 05, 1938 | F. Hardinge | Water separator for fluid lines | |
| 2,189,895 | Feb. 13, 1940 | F.P. Grutzner | Heating and Ventilating System | ||