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| All Patents in class 91/27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 490,864 | Jan. 31, 1893 | C.M. Conradson | Lathe | metal lathes | |
| 1,722,506 | Jul. 30, 1929 | H.G. Sahlin | Drop hammer | drop hammers | |
| 1,877,102 | Sep. 13, 1932 | F.N. Whitesell | Hydraulic Control Means | hoists, winches, come-alongs | |
| 1,924,545 | Aug. 29, 1933 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer | drop hammers | |
| 2,365,748 | Dec. 26, 1944 | F.W. Curtis | Hydraulic Circuit | milling machines | |