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 |
| 7331302 | Quick close security door system A security door closure system for cruise ships and other similar public entrance points to prevent terrorist attack or ship take-over is needed. Cruise ship passenger and ship provisioning entrance gangplanks pass through large hydraulically operated shell doors. T... | 02/19/2008 |
| 7121042 | Door assembly for sealing a chamber A door assembly providing an airtight seal for a chamber. The door assembly includes a link assembly that allows a door to move inward toward a gasket sealing an opening into the chamber. ... | 10/17/2006 |
| 7111571 | Arrangement in a marine vessel A marine vessel has at least two engines installed in separate respective engine compartments that are positioned substantially horizontally adjacent to each other and are separated from each other by a wall structure defining at least one opening provided with a fl... | 09/26/2006 |
| 5105755 | Pontoon boat gate with safety switch A boat including a deck equipped with peripherally upwardly projecting components surrounding a passenger area is provided including passageways from the passenger area between adjacent components leading to the deck periphery. Openable and closable gates... | 04/21/1992 |
| 4577577 | Sliding door arrangement A sliding door arrangement for closing a passage opening in a mainly vertical wall construction and comprising a mainly horizontally movable door unit, a door frame unit attachable to the wall construction, guide and closure devices of said door unit and ... | 03/25/1986 |
| 4197805 | Gate apparatus for fish unloading system A fish unloading system for removing fish from the main fish hold of a fishing boat. The lower portion of the main fish hold is filled with water and sufficient salt added to cause the fish to float near the surface of the water. A power-operated self-fee... | 04/15/1980 |
