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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 |
| 5297313 | Pivot hinge assembly for glass structures A pivot hinge assembly to pivot glass structures such as shower doors. The assembly includes a first hinge member having a pivot pin projecting therefrom and secured thereto. The pin is generally cylindrical but contains two opposing flat surfaces. The pi... | 03/29/1994 |
