Xerox introduced the "Xerox 9200 Duplicating System"

In the mid-1970s, Xerox introduced the "Xerox 9200 Duplicating System". Originally designed to be sold to print shops to increase their productivity, it was twice a fast as the 3600 duplicator at two impressions per second (7200 per hour). It was followed by the 9400, which did auto-duplexing, and then by the 9500, which was which added variable zoom reduction and electronic lightness/darkness control.