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| All Patents in class 417/544 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 19,834 | Apr. 06, 1858 | W. Douglas, B. Douglas | Portable pump | |
 | 30,603 | Nov. 06, 1860 | B. Douglas | Pump | |
 | 74,321 | Feb. 11, 1868 | J.W. Douglas | Improvement in pumps | |
| 213,276 | Mar. 18, 1879 | D. Bickford | Portable Pump or Engine | ||
 | 661,874 | Nov. 13, 1900 | W. Hull | Double Cylinder Pump | |