This is a Xerox glass slide used in the first successful experiment in xerography. Chester Carlson (1906-1968) invented the process of electrophotography, or xerography, in 1938. Over the next five ...
WEST CHESTER — Chester County Commissioners Josh Maxwell, Marian Moskowitz and Eric Roe recently ratified the selection of Heidi Carlson as director of the county’s Department of Aging Services.
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