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All Patents in class 55/447 | |||||
Number | Date | Patentee | Title | Type | |
2,001,121 | May 14, 1935 | A.A. Breuer | Portable suction cleaner | dust collectors | |
2,990,032 | Jun. 27, 1961 | R.L. Sandvig | Separator for use with rock drills | separators |