prov:value
| - Suitable supports for the photoconductive layers are, for example, foils of metal, such as aluminum, zinc, copper, sheets of cellulose products, such as paper, cellulose hydrate, cellulose esters, e.g. cellulose acetate, cellulose butyrate, or films of plastics, such as polyolefins, e.g., polyethylene, polypropylene, polyvinyl compounds, e.g., polyvinyl chloride, polyvinylidene chloride, polystyre
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