| http://www.w3.org/ns/prov#value | - inear path relative to said arm, said elevating mechanism including a sprocket or cable drum rotatably fixed with respect to said support column and said support arm, means for turning said sprocket or cable drum, and a chain or cable secured at each end thereof adjacent the top and bottom, respectively, of said lifting member and passing along said support arm and around said sprocket or cable dr
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