| http://www.w3.org/ns/prov#value | - In the 1940s and 1950s, several viable processes using either heat (thermography) or light (reflectography) were marketed by a number of firms, most notably Kodak and 3M. These small, desktop machines could make decent copies of high-contrast originals, but they required specially treated papers that were not only expensive per copy, but had poor stability and often curled and deteriorated quickly
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