NIPPON PGM Co., Ltd. NIPPON PGM Co., Ltd. was established as a joint venture by DOWA Metals & Mining Co., Ltd, Tanaka Kikinzoku Kogyo K.K. and Kosaka Smelting and Refining Co., Ltd. in 1991.DOWA, a top-class non-ferrous metals' smelter group, and Tanaka, a world-famous precious metals refiner, have joined their strenght, …