| http://www.w3.org/ns/prov#value | - The arrangements shown in FIGS. 1-3 and 6-8 may especially be used also in situations in which it is, for some reason or another, not possible to maintain/reach normal suction effect in the turning roll 18, 118, 218, and in which, for some reason, especially high underpressure levels are required in the rolls, or if it is otherwise desirable to increase the underpressure level of the roll with the
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