Did You Know...
...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 |
| 4169424 | Tension leg buoyancy structure A tension leg buoyancy structure for use in seas exposed to wave action including a buoyancy section, an anchor section which rests on the sea bed, and a plurality of parallel tethers connecting the buoyancy section with said anchor section to permit the ... | 10/02/1979 |
