Wrought Copper Products
Uji Copper & Alloy Co., Ltd.
Kiyomine Metal Industry Co., Ltd.
Kawasaki Sogyo Co., Ltd.
Kobe Steel, Ltd.
JX Nippon Mining & Metals Corporation
Sugino Metal Industries, Ltd.
Dowa Metaltech Co., Ltd.
NGK Insulators, Ltd.
Harada Metal Industry Co., Ltd.
Pan Pacific Copper Co., Ltd.
Furukawa Electric Co., Ltd.
Proterial, Ltd.
Materion Japan LTD.
Mitsui Sumitomo Metal Mining Brass & Copper Co., Ltd.
Mitsubishi Materials Corporation