| http://www.w3.org/ns/prov#value | - Obviously, a different type of unit such as a unit that ejects ink utilizing a piezoelectric device may be used. [0068] Reference numeral 100 represents a recovery system mechanism that has a cap member used for an operation of recovering suction of ink from the printing head unit 1 and for protecting the surface of the printing head where the ejection openings are formed.
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