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In page Xerox:
"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.[citation needed]
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