Who made VCRs for Zenith in the 1980s?

[ESigma25]

I've happened across a few 1980s Zenith VCRs from the early front-loader era and I've always been impressed by their very sturdy build quality. I know they're made in Japan, as all American brand VCRs were until Thomson took over RCA and GE, but who made VCRs for Zenith during the 1980s?