...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 |
| 3971095 | Remotely controlled collapsible dust pan A collapsible dust pan is disclosed wherein the user has the ability by a remote control means to keep the dust pan in a lowered position or to raise the dust pan and hold it in an upright position for storage. The dust pan is a hinged pan so that the pan... | 07/27/1976 |