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 |
| 4120005 | Mode selecting device for tape recording and/or reproducing apparatus A mode selecting device for a tape recording and/or reproducing apparatus includes a plurality of push-button members which are selectively actuable from rest positions to active positions for selecting corresponding operating modes of the apparatus, elec... | 10/10/1978 |
