...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 |
| 7114616 | Device for removable fastening of seats for housing containers to a metallic belt conveyor The device (D) for removable fastening of seats (3) housing containers (C) to a metallic belt (1) includes first fastening means (10) made on the metallic belt (1) and aimed at being mutually coupled with second fastening means (34... | 10/03/2006 |