Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7439462 | Circuit breaker interlock devices, systems, and methods Certain exemplary embodiments comprise a breaker interlock device adapted to mechanically resist switching a handle of a first circuit breaker from an OFF position to an ON position when a handle of a second circuit breaker is in an ON position, wherein the first ci... | 10/21/2008 |
| 7411139 | Circuit breaker interlock devices, systems, and methods Certain exemplary embodiments comprise a breaker interlock device adapted to mechanically resist switching a handle of a first circuit breaker from an OFF position to an ON position when a handle of a second circuit breaker is in an ON position, wherein the first ci... | 08/12/2008 |
| 7131780 | Keyboard A keyboard has a single row of eight multi-position keys with the letters arranged in a standard QWERTY keyboard configuration. The eight keys correspond to the eight fingers used when touch typing; each finger operates one key, and that key contains all the letters... | 11/07/2006 |
| 6864881 | Key switch-replaceable keyboard mounting arrangement A key switch-replaceable keyboard mounting arrangement. The arrangement includes a keyboard shell having an array of contacts on its inside. Rows of keys are suspended in the keyboard shell and adapted for triggering the contacts to produce a signal. Resilient locat... | 03/08/2005 |
| 6788284 | Devices, systems and methods for position-locking cursor on display device Devices, systems and methods for position-locking a cursor on a display device are provided. A preferred input device includes a position-locking device configured to electrically communicate with a computer. The position-locking device incorporates a lock-enable sw... | 09/07/2004 |
| 5510583 | Assembly for sequential switching A switch assembly having a rocker type actuator user moveable for actuating plural switches in a housing. The rocker type actuator includes first and second rocker members journalled together for rotation about a common axis. The first member has a paddle... | 04/23/1996 |
| 4904831 | Mitered mechanical switches An improved phased-array active antenna transmit-receive means utilizing a multiplicity of individual transmit-receive cells positioned in an array format upon a common wafer of semiconductor material. Each transmit-receiver cell, comprises a multiplicity... | 02/27/1990 |
| 4773089 | Telephone line-switching device A telephone line-switching device comprises first and second switches that interlock and a lock plate extending between the two switches. The push member of the first switch has a cam with which the lock plate usually engages. The push member of the secon... | 09/20/1988 |
| 4742186 | Switch device with interlocking slide A slide for an interlocking switch device which can reduce the thickness and simplify the structure thereof by reducing the thickness of material of components without changing the height. The slide has an interlocking cam operating portion and a simultan... | 05/03/1988 |
| 4670629 | Alternate action push-push switch An alternate action push-push switch is disclosed, having a housing with a dielectric bar portion; a plurality of conductive terminals; a plurality of conductive spring contactors having an inclined segment in proximity to the dielectric bar portion and a... | 06/02/1987 |
| 4145590 | Actuation for sequentially operating plural switches An electrical switch apparatus includes at least a pair of electrical switches and an actuating mechanism for sequentially actuating the switches. Each of the switches includes a push button which is movable between first and second positions, and the act... | 03/20/1979 |
