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| All Patents in class 239/581.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 596,950 | Jan. 04, 1898 | J.M. Stratton | Cleansing apparatus for paper-making machines | ||
| 1,345,802 | Jul. 06, 1920 | F.E. Munschauer | Gage for sheet-metal shears, &c. | sheet metal | |
| 2,042,782 | Jun. 02, 1936 | E.A. Hall | Dust Removing Means for Valve Seat Grinders or the Like | dust collectors | |
| 2,042,783 | Jun. 02, 1936 | E.A. Hall | Adjusting Means for Sleeve Bearings | industrial machine bearings | |