...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 |
| 4566641 | Sheet breaking apparatus A sheet breaking apparatus for breaking or cutting waste sheet materials according to the invention comprising a pair of endless band-like rotating body, one of which is driven downwardly or in a feeding direction of the sheet materials at a faster speed ... | 01/28/1986 |