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 |
| 6901957 | Hot gas bypass isolation A bypass line assembly comprising a bypass line for transporting a gas in a flow direction, a bypass valve located at a position along the bypass line, and a manual throttle valve located upstream from the bypass valve, the manual throttle valve comprising a throttl... | 06/07/2005 |
| 5511481 | Lightweight pyrotechnic compressor A breech assembly similar to a modified shotgun breech is used to fire gaus combustion products from a shotgun type pyrotechnic cartridge into a tank that holds the compressed gas. This compressed gas can then be used to drive power tools, inflation asse... | 04/30/1996 |
| 4626031 | Apparatus for loosening and/or breaking coal deposits, rocks, granular or lumpy material, or scrap An apparatus for breaking coal or other mineral matter from a bed thereof which comprises a string filling a bore hole which can rise steeply in this bed. The string consists of alternating breaking units and connecting pipes each braking unit having a di... | 12/02/1986 |
| 4301731 | Air shooting system for the mining of coal or the like An air shooting system for use in lieu of explosives in the mining of coal employing a set of tubular shooting heads fitted in respective shot holes in a coal seam. Each shooting head is fed with air under high pressure and has a valve mechanism for trigg... | 11/24/1981 |
