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 |
| 4351542 | Flexible towing hitch A towing hitch having a main frame for attachment to a vehicle, a tongue force transmitting member pivotally coupled to the main frame, and a resilient member supporting said force transmitting member so as to absorb shock forces applied to the last menti... | 09/28/1982 |