| http://www.w3.org/ns/prov#value | - However, these combinations also have the further advantage that the provision of dual back walls 15 and 15a, or the provision of the removable or pop-up container, or the provision of the pull-out tray, provides assurance that a sharp instrument, such as a scalpel, cannot pass through the instrument passer to the handle area in which a holder's hand is positioned.
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