Did You Know...
...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 5433024 | Edge-lighted display A tapered-transparent acrylic plate has advertising or the like applied to front or back surfaces. The thick end of the plate has openings to receive illumination sources. Incandescent sub-miniature lamps are mounted to a circuit board and are closely cou... | 07/18/1995 |
