Medical operating tables and structural parts for operating tables, namely, head rests, arm rests, leg rests, body supports, body cushions, body straps and restraints, knee crutches, stirrups, tube holders, infusion stands, radial setting clamps, anesthesia screens, instrument trays, table extenders, secretion basins, splash guard covers, paper roll holders, side rails, PVC protective covers, X-ray cassette holders, and image intensifiers