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| All Patents of Type: pump unloaders | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,446,511 | Feb. 27, 1923 | H.C. Little | Pump Unloader | pump unloaders | |
| 2,481,183 | Sep. 06, 1949 | H.R. Welby | Pump Priming Means | reciprocating pumps | |