| http://www.w3.org/ns/prov#value | - In combination, a support, an upper and a lower door hingedly mounted on said support for swinging movement about horizontal axes, operating means for controlling the opening and closing movement of said doors, said means including a bell crank lever pivotally mounted on said support, first link means pivotally interconnecting said bell crank lever and said upper door, second link means pivotally
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