| http://www.w3.org/ns/prov#value | - on rod for actuating said piston, and a vent means in said closure for venting the interior of the container to facilitate the removal of said closure when the interior of the container is under a negative pressure, said vent means including a vent opening defined by a projecting boss formed on said closure, said vent opening communicating directly with the interior of said container, and a vent c
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