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 |
| 7292424 | Arcing horn device An object of the present invention is to provide an arcing horn system having a highly efficient dynamic current shutoff property including a dynamic current shutoff capability, for example, enough for the short circuit fault and other object thereof is to provide a... | 11/06/2007 |
| 7146256 | Power source switching unit and power source management system comprising it Each power source switching unit (8) of a electric power system (1) constituted of a power operating system having a power generator (3) driven by an external power source (40) and an engine (4) is constituted of a means for sensin... | 12/05/2006 |
| 6910614 | Vacuum compression brazing furnace and method of using same A vacuum heat treating furnace for brazing a large metallic part is disclosed. The vacuum furnace includes a pressure vessel having a cylindrical wall and a door dimensioned and positioned for closing an end of the cylindrical wall. A workpiece handling system is mo... | 06/28/2005 |
| 6407908 | Gas-insulated circuit breaker and gas-insulated switch-gear having the same In order to provide a good gas-insulated circuit breaker which is compact and easy in assembling and preparation, a gas-insulated circuit breaker 100 is constructed with a grounded enclosure 104 enclosed a insulation nature gas, a current interruption par... | 06/18/2002 |
| 4101748 | Modular puffer-type circuit-interrupter unit adaptable for different voltage and current ratings An improved modular, puffer-type circuit-interrupting unit is provided capable of its own independent support, and adaptable for use, either as a singular modular unit, or when used with a plurality of similar units, constituting a conjointly-acting group... | 07/18/1978 |
