| http://www.w3.org/ns/prov#value | - To contract the mask pattern 20, the radially outer forcing elements, such as the forcing element 34 of the actuator 24 of FIG. 4, lying on the corner axes 26 and 27 apply primary loads of identical magnitude at locations 26a, 26d, 27a and 27d in the second direction perpendicular to the plane of the mask element 13.
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