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 |
| 3960185 | Ribbon weaving loom construction In a ribbon-weaving loom, in which at least two ribbons are being woven simultaneously and must be withdrawn in substantial parallelism, at least one withdrawing roller is provided for each of these ribbons and so located that the respective ribbon is tra... | 06/01/1976 |
