Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4331160 | Method for detecting and recording physiological changes accompanying emotional stresses This invention relates to a device and method for detecting and recording a single electrical effect responsive to physiological changes accompanying emotional stresses, and in particular it relates to associated multiple stage amplifier circuits, having ... | 05/25/1982 |
| 4202512 | Level layer winding method and apparatus A material strand automatic winding mechanism, and more particularly to the strand feeding and distributing device, and in particular a level layer guide device. This invention relates to a guide for uniformly winding a strand in a level layer on a spool,... | 05/13/1980 |
