Before revision: In 1981, responsibility for the laser videodisc was sold to Pioneer Electronic Corporation, after MCA Discovision had previously started a partnership with Pioneer, Universal Pioneer, to produce the Pioneer PR-7820 player , the first industrial model of DiscoVision player from 1978 , as well as establishing disc pressing plants in Japan.
After revision: In 1981() responsibility for the laser videodisc was sold to Pioneer Electronic Corporation, after MCA Discovision had previously started a partnership with Pioneer, Universal Pioneer, to produce the Pioneer PR-7820 player , the first industrial model of DiscoVision player from 1978 , as well as establishing disc pressing plants in Japan.