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 |
| 6539573 | JetNet The JetNet has a slightly flared bell shaped plastic resin head with wheels at the bottom, and an electric boat motor inside. Attached to a bracket on the head, a removable pool pole is used to move the machine around under the water: A mesh bag is secure... | 04/01/2003 |