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In page Xerox:

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Meanwhile, a small lab team was borrowing copiers and modifying them. The lab was developing what it called long distance xerography (LDX) to connect a modified 813 copier to a CRT based scanner using a special service (TELPAK) of the public telephone network, so that a document scanned on one machine would print out on the other. The LDX system was introduced in 1964, followed in 1966 by the Magnafax Telecopier, a much smaller, slower and less expensive version that acoustically coupled to a desk phone. However, fax machines would not become a truly mainstream device until the 1980s.[citation needed]