...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 |
| 4856226 | Vacuum insect eradication device An insect eradication device utilizes an incandescent light source to lure insects into a predetermined zone proximal the apparatus enclosure. A suction fan establishes a sub-atmospheric region within the enclosure. Insects with the predetermined zone are... | 08/15/1989 |