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In 1884, a number of American newspapers reported that the French railway companies were about to adopt an electric gate opener. “A catch connected with an electro-magnet keeps a gate closed,” reported The National Tribune on October 9, 1884. [ 3 ]
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Typically, the bar has a 90° range of motion with a vertical raised resting position and a horizontal lowered resting position. Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. [7] Bar gates are frequently paired end to end or closely offset to block traffic in both directions.
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The installation name changed to Defense General Supply Center to match its new logistical mission. In 1977 Defense Supply Agency became Defense Logistics Agency. In 1986, depot operations were separated from inventory control point functions and a separate command was established on the site: Defense Distribution Depot Richmond.
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