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 |
| 6527565 | Adjustable light display assembly This invention relates to an adjustable light display assembly in which the light is adjustable in a manner of a track light with the support for the light capable of assuming many configurations including wall panels, support stands and multiple light fi... | 03/04/2003 |
| 6040525 | Electrical clip and method An electrical clip for attaching an electrical conductor to the face of a bar characterized by a U-shaped rigid housing having opposed windows through which a conductor may be inserted, spring legs shaped to embrace and snap around both edges of a bus bar... | 03/21/2000 |
| 5207589 | Current conducting system The current conductor arrangement, more especially for illuminating systems of all types, comprises a current conductor rod whose mutually insulated metallic current conductors make up at least 50% of the cross sectional area of the current conductor rod.... | 05/04/1993 |