...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
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| Number | Title | Issue Date |
| 4606098 | Pendulum rod immobilizing device A pendulum rod immobilizing device for immobilizing the pendulum rod of a clock in order to prevent damage to the clock by motion of the pendulum rod during transport. The pendulum rod is immobilized by engagement with a pendulum rod retainer provided on ... | 08/19/1986 |
| 4043118 | Pendulum device for battery-powered clockwork mechanism A battery-powered clockwork mechanism and a separate pendulum unit which is detachably connected to the clockwork mechanism. When so connected the pendulum device is powered by the battery in the clockwork mechanism but operates as a "blind" pendulum whic... | 08/23/1977 |