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 |
| 5291677 | Rotary photograph file A rotary file is disclosed herein for holding a plurality of photo holders slideably carried on a pair of spaced-apart rings between support members which are mounted on a base by a swivel mechanism. The rings include an extension arm securing each ring t... | 03/08/1994 |
| 4165575 | Rotary card file A plurality of rotatable card holders are disposed end-to-end on a horizontal fixed shaft supported at its ends by a tubular frame. Each of the card holders comprises two coaxial sections each of which is generally cylindrical with a peripheral web for ho... | 08/28/1979 |
