...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 |
| 6943653 | Bistable electric switch and relay with a bi-stable electrical switch The invention relates to a bi-stable electric switch comprising a spring (101) that is configured as a bi-stable snap-action spring and carries contact elements (114, 116) on the carrier strip (104) of the spring and comprising at least one driv... | 09/13/2005 |
| 4339741 | Thermally actuated time delay switch A thermally actuated switch which embodies an active unit which includes a heat responsive element which is part of an enclosure enclosing electrical resistance elements for heating. Heat is applied internally to the enclosure and cooling is by way of dis... | 07/13/1982 |
| 3967227 | Actuator system with ambient temperature compensation An actuator system for use in an electrical relay or the like. An actuator member is carried by a frame and is movable between a first and a second position, being biased toward its first position by a spring and having an actuating wire coupled between i... | 06/29/1976 |