Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 5460118 | Surface mounted modular signal device for elevators A modular signal device which fills the need of the elevator industry for differing types of signal devices wherein a surface mounted base plate includes turned up small ends, with a cover ring surrounding the base plate and utilizing a bolt at one small ... | 10/24/1995 |
| 4280205 | Ultrasonic fork height measuring apparatus The height to which the forks of a lift truck are raised is measured by an ultrasonic height measuring arrangement including a downward facing transmitting transducer, positioned on the truck platform in fixed position with respect to the forks, and a dow... | 07/21/1981 |
