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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 6260629 | Swing hitch An agricultural implement has a working position extending laterally behind a towing tractor and a transport position in which it is towed endwise behind the tractor. The implement has ground wheels that support the implement in both working and transport... | 07/17/2001 |
| 5335610 | Suspension for coulter wheel assembly An improved suspension for a coulter wheel assembly of the type primarily intended for attachment to a tractor wherein the improved suspension is characterized by its construction including a plurality of pivotal support bars interconnecting a set of doub... | 08/09/1994 |
| 4592429 | Roll-over variable width plow A two-way gang plow is provided with a pair of front steering wheels muonted for steering adjustment relative to a pivoted front axle. The steering mechanism for the wheels is coupled to a steerable tail wheel through master and slave hydraulic cylinders ... | 06/03/1986 |
| 4337832 | Lift system, steering system, and pivotal blade for land plane A land plane for leveling or grading the surface of a land area. The plane includes a frame defined by a center section and end sections pivotally connected to the center section, with each connection permitting relative physical movement about an axis tr... | 07/06/1982 |
| 4077651 | Hydraulic steering for plow A tractor-trailed plow having a steerable rear wheel is provided with a hydraulically powered steering system including master and slave cylinders arranged to steer the rear wheel in response to changes in the angular position of the plow with respect to ... | 03/07/1978 |
| 4070031 | Steering linkages A steering linkage for a wheeled trailer vehicle or implement comprising a frame, in which a bar is slidably mounted in a transverse frame member, the said bar having a rack formed thereon and in mesh with a pinion rotatble by a steering, or link, rod to ... | 01/24/1978 |
