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An Entity of Type : prov:Entity, within Data Space : webisa.webdatacommons.org associated with source dataset(s)

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  • In a system for protecting vehicles and pedestrians moving through a railroad crossing from being struck from an oncoming train, said system including a barrier positioned to block vehicle and pedestrian movement when the train approaches to within a predetermined distance of the crossing, the improvement comprising apparatus for viewing the crossing, detecting the presence of vehicles, pedestrian
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