| http://www.w3.org/ns/prov#value | - The base 206 is formed of a suitable rigid material, such as aluminum or steel. [0143] To support the patient arm support assembly 202, the frame 201 includes a series of vertical columns 210, 211, 212 extending upwardly from the base section 207 wherein column 212 is a seat-supporting column located centrally on the base 206. [0144] A generally rectangular upper frame element 214 is supported on
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