| http://www.w3.org/ns/prov#value | - Further, an as shown, the inside diameter of the annular portion of the tube T engaged in the groove 55 is preferably slightly greater than the inside diameter of the tube so that when the controller is used as intended and one side thereof is urged into engagement with a hard or rigid supporting surface structure, such as the retaining board of a related waterbed, the circularly-formed portion of
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