There are some misconceptions here. Yamaha developed their manufacturing process in house, of the Staggered Diagonal Seam/Air Seal System and began making drums in 1967. When the decision was made to go big in the drum business, Yamaha contracted with Sakae to build drums. Yamaha installed all the machinery and molds and trained Sakae in the Yamaha way of making drums. For the entire time Sakae built drums for Yamaha, all product development and design was done in house at Yamaha and then they taught Sakae in building the new models. Sakae also made the seamless metal snare drums and timpani for Yamaha. When Sakae started making drums under their own name in the last few years, they were still making drums for Yamaha. The first two years that Sakae displayed at NAMM, Yamaha loaned them all the free standing hardware for their kits. When the two companies finally split, Yamaha gifted all the machinery they installed in the factory to Sakae, and built all new machines and molds for the new factory in Xioushan.