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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 |
| 7275282 | Motor vehicle door lock A motor vehicle door lock having a casing (1), a drive (2) and a fixing device (5) for the drive (2). The fixing device (5) has a receiving element (6) for the drive (2) and the drive is fixed in the receiving element... | 10/02/2007 |
| 6978515 | Balancing device of raising-lowering window A balancing force adjusting device for a window which raises and lowers includes a case, a horizontal gear member, a click member and a vertical gear member. The horizontal gear member is rotatably arranged around the horizontal axis in a predetermined position with... | 12/27/2005 |
| 6357081 | Take apart door hinge with lock-on cam A disjoinable hinge mechanism having a locking cam is provided. The hinge mechanism includes a hinge assembly having a hinge pin which pivotably couples a first hinge structure to a second hinge structure. The hinge mechanism also includes a cam pivotably... | 03/19/2002 |
| 4953256 | Counterbalance mechanism A counterbalance mechanism for negating the force of gravity when moving a display cabinet shelf up or down. The mechanism has a torsion spring counterbalance on a shaft extending the width of the shelf and gears at each end of the shaft which engage trav... | 09/04/1990 |
| 4882806 | Counterbalancing torsion spring mechanism for devices which move up and down and method of setting the torsion springs thereof Counterbalancing mechanism for a garage door or other device in which a torsion spring end member is fastened to a second member to which it is connected during normal operation of the counterbalance by cooperating interfitting elements on the members whi... | 11/28/1989 |
