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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 |
| 5372204 | Power tractor hitch relief system A power hitch relief system for a three-point hitch used in tractors and similar vehicles. The power hitch relief system includes an inclination detector in the form of a weight pivotally mounted to the tractor frame. The weight is also coupled to a relie... | 12/13/1994 |
| 4344499 | Tractor with anti-slipping and overloading controls A tractor has an engine, a torque converter, a lifting device for attachment to an implement such as a plow, the torque converter being controlled automatically whereby if an engine-driven ground wheel starts slipping, the torque converter reduces the tra... | 08/17/1982 |
