| http://www.w3.org/ns/prov#value | - A photographic reproduction process which compnises exposing an electrostatically charged, supported, photoconductive insulating layer to light under a'master and developing the resulting image with an electroscopic material, the photoconductive layer comprising a compound having the formula -Me/m in which R and R are halogen, Me is a metal and m is an integer equivalent to the vale
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