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...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 |
| 5249967 | Sports technique video training device A video training device and method for enabling a student athlete to closely pattern his dynamic technique after that of a recognized master. The exemplary device includes a pair of video cameras that transmit live images of the student as seen from those... | 10/05/1993 |
