| http://www.w3.org/ns/prov#value | - A bed according to claim 1 further comprising:a plurality of support wheels for supporting said frame on the floor; a guide wheel; and means for mounting said guide wheel relative to said frame with said guide wheel contacting a floor on which said frame is supported, including means for retracting said guide wheel from a guide position in contact with the floor to a retracted position above the f
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