It took over 20 years for the patent on the principle of dry photocopying, by Chester Carlson in 1938, to result in the Xerox 914 copier introduced in 1959.
Trebalo je 20 godina da patent Chestera Carlsona iz 1938., o načelima suhog fotokopiranja 1959. postane stroj za fotokopiranje Xerox 914.