Carlson's dry printer

The invention of the dry printer by Chester F. Carlson is briefly described. In 1938 he began the development of a continuous process electrographic printer, a precursor of the Xerox 914, the first production-line automatic office copier, which was introduced in 1959. Carlson approached 20 companies, but not until he met a Battelle Memorial Institute engineer in 1944 did he arouse any real interest. After that it took four years of intense scientific and engineering work by Battelle and a little Rochester, NY, firm, The Haloid Co., before xerography was ready by its unveiling on Oct. 22, 1948.<
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