| http://www.w3.org/ns/prov#value | - The thus uniformly charged printing original plate is then exposed to an optical image, for instance, by being exposed to a reflected image formed by use of a light source such as a tungsten lamp, a halogen lamp, a xenon lamp or a fluorescent lamp, or through a positive film which is in close contact with the printing original plate and which is exposed to light, or by He-Ne laser, argon laser or
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