| http://www.w3.org/ns/prov#value | - By this arrangement, the counterweight 58 will apply a predetermined tensioning force to the flexible element 60 which will be translated into a generally horizontally directed force component generally parallel to the table T to apply a corresponding force component to the frame 4 and hence, via the pin assemblies l1 and 12, to a selective portion of the patients body, such as the head, as seen i
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