By the 1970s, photocopying had become a $1 billion-a-year
business, with Xerox in the lead.
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They rented a new Xerox machine from Xerox Corporation.
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XEROX
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One can purchase a Xerox Phaser 8400 printer from retailers such
as Xerox Corporation, Xerox Canada, Professional Digital Services
and Fuji Xerox. One can also purchase online from sites such as
Office Xerox, Staples, Amazon and eBay.
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The correct way to use Xerox in a sentence is to use it to refer to a machine made by the Xerox corporation, or to the Corporation itself, for example:
They rented a new Xerox machine from Xerox Corporation.