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| All Patents in class 137/533 | |||||
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| Number | Date | Patentee | Title | Type | |
| 213,309 | Mar. 18, 1879 | W.C. Wilcox | Improvement in pumps | pumps | |
| 344,620 | Jun. 29, 1886 | J.G. Blount | Check-valve | ||
| 420,887 | Feb. 04, 1890 | F. Phillips | Escape-valve for dash-pots | ||