| http://www.w3.org/ns/prov#value | - It is obvious that more than one driving mechanism 20 may be placed in a bottom bar, for example, one at each end, the driving mechanisms being controllable in relation to each other, including being synchronized in relation to each other, but e.g. also in such a manner that rolling the screening up and down in non-rectangular windows, such as trapezoid or half-arched windows, may take place as we
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