...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 |
| 5807641 | Anti-bacterial and anti-fungal glaze composition for ceramic products The present invention provides an anti-bacterial and anti-fungal glaze composition for ceramic products formed by incorporating a silver-containing substance; and a refractory and/or glass composition. The present invention can be used in the manufacture ... | 09/15/1998 |