Juki bought Nakajima about 20 + years ago. They made their own machines and also manufactured a lot of parts for Juki under contract. When Juki bought Nakajima, their engineers went thru all of the models of machines they manufactured. Each one was tweaked and upgraded. Some keep the same model number, some got new model numbers. The Juki 441, 341, 245,246 machine were originally made and designed by Nakajima. All three of those are very good machines today.
glenn