| http://www.w3.org/ns/prov#value | - In a theatre or the like, scenery handling equipment including gridiron, multiple flying sets, including sets of non-fiat form and having supporting lines extending vertically from out-of-line points along the top edges thereof, adjustable sheave supports spaced above the gridiron, and sheaves distributed thereon in accordance with the distribution of lines from the stage sets, a multiplicity of w
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