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| All Patents in class 200/81.9R | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,658,890 | Feb. 14, 1928 | T.M. Foss | Wrench | pipe wrenches | |
| 2,628,296 | Feb. 10, 1953 | E.J. Dillman | Flow Switch | flow controls | |