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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 |
| 7581649 | Reverse flow spin-cleaning liquid filters In a liquid filter of the reverse-flow flush-cleaning type, the present invention provides the improvement of mounting the pack of discs (170) intermediate to an assembly including a seat member (200) and screw-thread split-ring (202). ... | 09/01/2009 |
