Ajit Pai @AjitPai
OTD in 1942, the @uspto granted Chester Carlson a patent for what we now call photocopying. Years later, Carlson's invention of "xerography" would become the mainstay of @Xerox. https://t.co/ZxtvaGSEGm https://t.co/srb7PcYfnE https://t.co/G7ep02cKWN — PolitiTweet.org
Ajit Pai @AjitPai
OTD in 1938, Chester Carlson and Otto Kornei put a glass slide with writing on it on a zinc plate coated with sulfu… https://t.co/qXxunpDO53