...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 |
| 7021223 | Method and apparatus for injecting gasification medium into particle-loaded gasification spaces Method and apparatus for injecting gasification medium into particle-loaded gasification spaces of fixed-bed, fluidized-bed or entrained-bed gasifiers by means of gasification-medium nozzles, wherein the supply portion the isorate of the gasification medium in the g... | 04/04/2006 |