| http://www.w3.org/ns/prov#value | - Moreover, it is also possible for honeycomb areas designed according to the invention to alternate, in the longitudinal and/or transverse direction of a honeycomb, with others of a different design, e.g. with a different, possibly conventional, duct structure or with an open substrate structure permitting virtually unobstructed fluid exchange transverse to the direction of .flow over substantial a
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