| http://www.w3.org/ns/prov#value | - The invention will now be described by way of example with reference to the accompanying drawings, in which: FIG. 11 is a sectional elevation of the optical apparatus of a blemish detector of known form as used to detect blemishes in a surface of a moving web, FIG. 2 is a sectional elevation of the optical apparatus of a blemish detector according to the present invention as used to detect blemish
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