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| All Patents in class 251/155 | |||||
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| Number | Date | Patentee | Title | Type | |
| 566,841 | Sep. 01, 1896 | F.B. Charroin | Pneumatic Stacker | hay or straw stackers | |
| 1,781,554 | Nov. 11, 1930 | A.G. Norton | Lubricator | oil pumps | |