Nakamichi MC1000: who designed and built it?

I’m a sucker for vintage LOMC cartridges and enjoy ’tracking’ their origin, often with the help of the collective knowledge shared on this forum. But in the case of the Nakamichi MC1000 I haven’t been able to find out who designed and built it. It may have been designed by Nakamichi engineers, perhaps to complete their TX-1000 turntable system. But it’s probably less likely they also built it themselves.

Does anyone have the facts?