In 1979, I doubt copiers were 'increasingly obsolete'; I'd expect the market was growing rapidly. Laser printers, email, the Internet, didn't yet exist; PCs barely existed, and not in offices. Almost everywhere would have used typewriters, I suppose.
Xerox's copier sales peak was in the early 70's, and then multiple international companies [primarily in Japan] began creating better, less expensive copiers. By the late 70's, Xerox was massively losing marketshare [to both competitors, and to blossoming word processing technologies].
>Laser printers, email, the Internet, didn't yet exist
Actually, all three did; the latter was in the form of ARPANET [to be technical, not "The Internet"].
In 1979, I doubt copiers were 'increasingly obsolete'; I'd expect the market was growing rapidly. Laser printers, email, the Internet, didn't yet exist; PCs barely existed, and not in offices. Almost everywhere would have used typewriters, I suppose.