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 |
| 5402547 | Ballast broom A ballast broom machine for sweeping ballast off a track comprises an elongated machine frame supported on the track by undercarriages, and at least three ballast brooms vertically adjustably mounted on the machine frame, the ballast brooms being spaced f... | 04/04/1995 |