Did You Know...
...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 |
| 5256490 | High opacity flexible composite material A high opacity flexible composite material is receptive to printing on opposing outer surfaces without a printed image on one surface being visible from the other and without a printed image on the other surface being visible on the one surface, the compo... | 10/26/1993 |
