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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 |
| 4838859 | Steerable catheter Steerable catheters are achieved using a filament which changes its configuration in response to a changed environmental condition (e.g. temperature) and a controller to change that environmental condition as desired. Alternatively, inflatable members can... | 06/13/1989 |
