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 |
| 6234157 | Paintball gun loader speed collar A container which can be held and opened by one hand has a dome-shaped cap formed by a series of adjacent, contiguous and ogee-shaped segments resiliently held together by an elastic ring. When the cap is forced down over the opening rim of the vessel, th... | 05/22/2001 |