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Herder, J.L. (author), Tuijthof, G.J. (author)The object (2) is supported on the end of one arm (4). The arm is an extension of one side of a hinged parallelogram of rods (7, 8, 9, 12). The corner of the parallelogram opposite the end (10) of the carrying arm in attached to a stationary pivot point (3). Springs (5, 14) in tension are connected between the parallelogram and two other...patent 2000