| http://www.w3.org/ns/prov#value | - According to this construction, when jetting failure such as non-jetting or bending of the jetting direction occurs at any of the first nozzles in the first liquid-droplet jetting head, the second liquid-droplet jetting head is moved to a position, corresponding to the first nozzle at which the jetting failure occurred (failed first nozzle), so as to jet the liquid from a second nozzle among the s
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