| http://www.w3.org/ns/prov#value | - In this case the flexibility in one plane could be used to sense the distance to the surface, i.e. to find whether a step or edge in the surface relief marking is present, whereas the movement in the second plane, which would be a steered movement, caused for example by bending of a cantilever when subjected to heating, is used to traverse the surface relief marking in a direction generally parall
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