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| All Patents in class 209/719 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 458,550 | Aug. 25, 1891 | O. Kutsche | Process of and apparatus for separating dust from air | |
 | 2,624,460 | Jan. 06, 1953 | G.A. Parten | Gas separator for grinding mills | |