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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 |
| 6978516 | Apparatus for controlling various movements of a door Apparatus for controlling various and different movements of a door, said apparatus having a door hinge assembly with a hinge pin having a plurality of bearing surfaces to reduce stress and wear on a hinge pin housing, a torque mechanism for pre-torquing and torquin... | 12/27/2005 |
