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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 |
| 7681816 | Wood crusher A wood crusher having a crushing apparatus includes a crushing rotor for crushing target wood to be crushed, a second screen detachably mounted on the outer peripheral side of the crushing apparatus and a screen support member disposed on the outer peripheral side o... | 03/23/2010 |
| 7258293 | Wood crusher and wood treating method A wood crusher has body frame; a crushing apparatus installed on the body frame and a crushing rotor rotated in a crushing chamber. A feed conveyor for conveying wood to be crushed is installed on one side of the body frame in the longitudinal direction thereof and ... | 08/21/2007 |
