| http://www.w3.org/ns/prov#value | - This movement of the trolleys as caused by the frame, allows the trolleys 2a and 2b to be moved in the same direction relative to the cable suspension point 8 to shift the center of gravity of the combined body including the main beam and other parts and the load suspended from the trolleys, When the center of gravity is shifted into vertical alignment with cable suspension point 8, the overall lo
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