In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Application No. | Application Title | Issue Date |
| 20080276919 | Piston, A Ring and a Piston Assembly for a Two Cycle Engine A piston ring (3) for a two cycle internal combustion engine has a sealing portion (4) and a piston engaging portion (5) adapted to engage with a ring engaging portion of a piston (200) to restrict radial movement of the sealing portion (5... | 11/13/2008 |