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| All Patents in class 137/637 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 298,194 | May 06, 1884 | H.F. Frisbie | Puppet Valve | ||
| 1,083,006 | Dec. 30, 1913 | G.F. De Wein | Trimmer-saw | ||
| 2,286,880 | Jun. 16, 1942 | W.A. Traut | Hydraulic Control System | ||
| 2,335,824 | Nov. 30, 1943 | E.J. Dillman | Valve | ||