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| All Patents in class 91/396 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,877,102 | Sep. 13, 1932 | F.N. Whitesell | Hydraulic Control Means | hoists, winches, come-alongs | |
| 3,913,451 | Oct. 21, 1975 | D.I. McDonald | Hydraulic Cylinder with Cushioning Means | hydraulic apparatus | |