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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 |
| 6424821 | Working machine and its communication method A working machine includes a cutting machine, a tool holder which can be installed to or removed from the spindle of the cutting machine, a transmission and reception mechanism installed in the tool holder, and a controller for performing radio communicat... | 07/23/2002 |
