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 |
| 4891470 | Screw-type cable fitting In a screw-type cable fitting for holding cables, edged grains consisting of hard, electrically insulating material, in particular, sand, are arranged on the clamping surface of a clamping part, for example, an elastic ring or a clamping cage, and dig int... | 01/02/1990 |