Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 4312497 | Hydraulic winches A grooved winch drum is driven by a reversible hydraulic motor. A pump supplies fluid to the motor through a system using an electrically controlled four-way, flow direction valve associated with a counterbalance valve and a manually adjustable flow contr... | 01/26/1982 |
| 4294495 | Boom sockets A boom socket in which the gooseneck assembly and cross pin are supported in rolling contact bearings and in which the construction and materials eliminate free play and minimize corrosion and otherwise reduce maintenance to a minimum.... | 10/13/1981 |
