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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 |
| 7218748 | Tapered thickness surround for high excursion speaker driver A speaker driver surround has tapered thickness to provide improved linearity of the force versus displacement response. The tapered thickness surround provides for a larger emissive piston area, thus increasing the acoustic efficiency of the transducer. The surroun... | 05/15/2007 |
