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| Number | Title | Issue Date |
| 6922136 | Security method for vehicle safe driving support system A security method for a vehicle safe driving system provides drivers information for safe driving, that is, when a sensor does not detect any danger when there is a danger on the road, when there are some limits in the system operations, or when a portion of the sys... | 07/26/2005 |
| 6809654 | Message board with work lights for vehicles A deployable message display and work light structure for attachment to a vehicle. Said structure comprises an anchor assembly attachable to the front or rear end of a vehicle, a message display panel support frame having parallel arms hingedly secured at their lowe... | 10/26/2004 |
| 6034609 | Motorless traffic-control sign automatically responsive to state of electrical power A traffic-control sign that automatically displays a primary message, such as "STOP", when electrical power is absent, and an optional secondary message, such as "We Arrest Drunk Drivers", when electrical power is present. The motorless sign is continuall... | 03/07/2000 |
| 5504481 | Fail-safe stop light apparatus An apparatus for covering a face of a traffic light with a warning sign as a result of a power failure to the traffic light. A first member is rotatably mounted to one side of the traffic light and a second member is rotatably mounted to the other side of... | 04/02/1996 |
