| http://www.w3.org/ns/prov#value | - As described above, besides the example given above, there may be considered various kinds of means for detecting an ink pressure or an ink residual amount by making use of a magnetic flux density detecting system using a Hall element or the like, or by making use of a magnetoresistance detecting system using an MR element or the like, and by sensing the displacements of a flexible diaphragm provi
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