| http://www.w3.org/ns/prov#value | - FIG. 17 is a graph that shows the relationship between a collected amount of particulates and a pressure loss in each of the filters according to examples and comparative examples, and FIG. 17( b) is a graph that shows the relationship among ?? (aperture ratio), an initial pressure loss and a pressure loss after collection of 6 (g/L) of particulates, in each of filters according to the examples an
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