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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 |
| 6516061 | System for and method of extending a PBX phone port to a remote phone device A system for establishing a voice and signaling link through a PBX system from an remote telephone device includes a PBX system, a setless gateway, and an remote telephone device. The PBX system is coupled to a public switched telephone network (PSTN) via... | 02/04/2003 |
