| http://www.w3.org/ns/prov#value | - prising steps of: unpolarizing said focused light beam substantially to present a approximately true circle cross-section and irradiating said paper practically at a right angle thereto with such focused light beam, picking up a range to be measured by image pick-up means, said range including an image to be measured formed by the light beam transmitted through said paper on a surface of said pape
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