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| All Patents in class 137/402 | |||||
| Picture | Number | Date | Patentee | Title | |
| 2,019,461 | Oct. 29, 1935 | P.S. Russel | Control Means | ||
| 2,416,267 | Feb. 18, 1947 | W.S. Landon | Automatic Orifice Cleaning Device | ||