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 |
| 6778081 | Fire department station zoned alerting control system An alerting system for fire stations utilizes programmable message centers, zone-coded lighting and audio modules to alert only selected personnel for a particular type of emergency, i.e. fire, medical, etc. to decrease response time while reducing stress to remaini... | 08/17/2004 |
| 6535121 | Fire department station zoned alerting control system An alerting system for fire stations utilizes programmable message centers, zone-coded lighting and audio modules to alert only selected personnel for a particular type of emergency, i.e. fire, medical, etc. to decrease response time while reducing stress... | 03/18/2003 |
| 4468656 | Emergency signalling unit and alarm system for rescuing endangered workers An emergency signalling unit which is designed to be carried on the person of a fireman or other worker to alert control personnel should the worker become endangered, and an alarm system which incorporates a plurality of such signalling units, each one w... | 08/28/1984 |
