| http://www.w3.org/ns/prov#value | - A device for adjusting a length or inclination of a support for a percussion musical instrument, including an articulated ball formed of a plurality of sector members forming a central channel for receiving an adjusting rod-shaped member, clamping jaws having inner surfaces defining a socket for retaining the articulated ball and forming therewith a ball-and-socket joint, and a tensioning element
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