Has anybody heard of Maruishi Alu-Tech model? I've found an old Maruishi road bike. Aluminum frame with shimano 105 components. The only labels on the bike are "Maruishi", "Made in Japan", "Aluminum Series 7000", "Alu-Tech", and 3 yellow/red/blue pictures showing running, biking, swimming.

Has anybody heard of this model? Any idea of when it was made?
Thanks,
tor