Dual coreless motor used in Dual DD turntables that were among their first efforts. In fact, the story I read is that Dual sued Kenwood over copyright infringement, and Kenwood had to very slightly re-design their coreless motor so as to appease Dual.
I did not know this story, anything can happen no wonder even if in a coreless motor there is not much to modify after having produced it if other brands intend to make it; did you know that Papst made the DD motors for Dual?
Now it could be that Dual designed the DD motor completely in-house and then entrusted the realization to Papst, as it could be that Papst designed and built the motor and Dual decided to use it; these are all hypotheses my where there is no absolute certainty.