As the raw materials required by our compound semiconductor substrates play such an essential role in our growth and reproducibility, we have investments in 10 subsidiaries & joint ventures in China. Through them, we manufacture and sell critical materials and parts listed in the products overview. This arrangement reduces our dependency on other suppliers of raw materials, plus it affords us price and volume stability unavailable to those purchasing on the open market. We allow these companies to sell on the open market which results in additional diversity for revenue & income.