...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 |
| 5653480 | Pipe coupling A pipe coupling is constructed such that: a pressing member is supported by an inner collar and presses an inserted pipe body in a state in which the pressing member contacts an inclined surface of an outer collar; the inclined surface of the outer collar... | 08/05/1997 |