Thanks for this, Jon, it's always a pleasure being corrected on this forum.😀
So Mito Nikon and Tochigi Nikon are manufacturing plants within the Nikon group ? Where is the main manufacturing being done (DSLRs and lenses) ?
Yes, absolutely. Companies cannot use Nikon in their name unless they are Nikon owned group companies. Mito Nikon was, I believe, an independent group company, but it is now a factory of Nikon Imaging Company which is the photographic equipment arm of Nikon Corporation.
Mito is a city name and the Mito Nikon factory is there. Tochigi is a prefecture name, and Tochigi Nikon is there. Other imaging companies (Canon for sure, I forget who else) also have manufacturing facilities in Tochigi Prefecture.