| http://www.w3.org/ns/prov#value | - A chin strap, comprising: a chin cup; side straps provided to respective sides of the chin cup; a rear strap; and a strap connecting member to interconnect the side straps and the rear strap, the strap connecting portion including a portion adapted to extend over the top of the patient's head, first connectors for attaching respective side straps, and second connectors for attaching the rear strap
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