I lived in Japan in the late 90's.. Whenever I took the train to Tokyo I would pass the Miyata factory in Chigasaki.
The sponsor of the local bike club was a Miyata dealer. He sold many fine bikes with their label. When I asked if he could arrange a tour of their Chigasaki factory, he said sure, anytime ... but they're not making bikes there any more, only fire extinguishers.
Sure enough, when I checked the fire extinguishers at work, they were all Miyata made (http://www.gear-m.co.jp/)
Amir Avitzur
Ramat-Gan, Israel