| http://www.w3.org/ns/prov#value | - The invention thereby provides great merits in terms of performance and cost. [0108] In addition, since the invention uses a one-way valve unit to prevent liquid leakage from the sealed space where a liquid such as ink is held, while allowing air or liquid to be introduced from the outside into the sealed space, it is possible to use up the liquid in the sealed space almost completely.
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