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| All Patents in class 187/302 | |||||
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| Number | Date | Patentee | Title | Type | |
| 66,879 | Jul. 16, 1867 | L.H. Olmsted | Drop Hammer | drop hammers | |
| 130,877 | Aug. 27, 1872 | N.C. Stiles | Improvement in drop-hammers | drop hammers | |
| 453,980 | Jun. 09, 1891 | E.S. Matthews | Hydraulic valve-gear | ||
| 519,639 | May 08, 1894 | E.S. Matthews | Hydraulic valve | ||