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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 |
| 5655461 | Robbery deterrent system for convenience stores A robbery deterrent apparatus and method is provided for convenience stores or other businesses vulnerable to armed robbery, in which a would-be armed robber is incapacitated by an aerosol agent that is delivered in a predetermined pattern within the stor... | 08/12/1997 |
