| http://www.w3.org/ns/prov#value | - olded, a pair of transversely spaced straps straddling said frame members and leg members, one of the leg members being rigidly secured to said straps at one end of the latter, the other end portions of the straps being provided with longitudinal slots, a pivot element extending through said slots and connecting the other leg member and one of said frame members to the straps, and a second pivot e
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