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| All Patents in class 251/259 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,918,931 | Jul. 18, 1933 | F.F. Rike | Gasoline pump and a valve therefor | ||
| 1,968,666 | Jul. 31, 1934 | H.W. Webb | Swinging gate valve | industrial valves | |