| http://www.w3.org/ns/prov#value | - These and other objects and advantages of the invention will be more fully understood from the following detailed description of the drawings, in which: Fig. 1 is a schematic section of a simple radial gate incorporating the principles of the invention; Fig. 2 is a plan view of the Fig. 1 gate; Fig. 3 is a schematic section of a vertical lift gate to which the invention is applied; Fig. 4 is a pla
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