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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 5619438 | Filter circuit for use with real-time image converter The invention provides a filter circuit for use with a real-time video image converter. The filter circuit interpolates among a first sequence of digital pixel values and decimates among the interpolated sequence to generate a second sequence of digital p... | 04/08/1997 |
