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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 |
| 6696925 | Electrical revenue meter and instrument transformers mobile station A mobile metering system (MMS) comprises a trailer-mounted fully-enclosed three-phase set of current transformers (CTs) and power transformers (PTs), and a metering interface. The instrument transformers reduce the source voltage to a meterable level. The... | 02/24/2004 |
