| http://www.w3.org/ns/prov#value | - Cylinder or drum 11 around which are stationed the various stages of the photographic process provides a cylindrical support surface of an electrically conductive material such, for example, as a metal surface or the like, on which is placed a photoconductive insulating layer such, for example, as a layer or coating of vitreous selenium or other photoconductive insulating material.
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