■Japanese companies
Takehara Chemical Industrial Co.,Ltd.
Nitto Funka Industry Co.,Ltd.
Asahi Rubber Co., Ltd.
Diabond Industry Co.,Ltd.
Nippon Zeon Co.,Ltd.
Ikuyo & Co.,Ltd.
Dainippon Ink & Chemicals Inc.　
Zeon Kasei Co.,Ltd.
Ikuyo Trading Co.,Ltd.
Ｉnax Corporation
Bihoku Funka Kogyo Co.,Ltd
Ipposha oil chemical Co.,Ltd.
Tesco & Co.,Ltd.
Fujikura Rubber Ltd.
ＮＯＫ Co.,Ltd.
Okutama Kogyo.Co. Ltd.
Toyo ink seizo Co.,Ltd.
Kitajirushi Co.,Ltd.
Toyo Denka Kogyou Co.,Ltd.
Furuto Industrial Co., Ltd.
Kinugawa Rubber Industry Co.
Toyo Unikon Co.,Ltd.　
Mitoyo Co.,Ltd.
Kinugawa Pacific Co.,Ltd.
Towa Corporation
Sankyo Seifun Co.,Ltd.　
Muraoka Rubber Reclaiming Co.,Ltd
CI Kasei Co.,Ltd.
Nikkemi trading Co.,Ltd.
Dupond Dow Erastomer Co.,Ltd.
Yokohama Rubber Co.,Ltd
Shiraishi Calcium Co.,Ltd.　
Meiwa industry Co.,Ltd.
Meiwa Sangyou Co.,Ltd.

■Foreign companies
Bemis Manufacturing Co.　(Sheboygan Falls, WI, U.S.A.)
Field Fresh Tasmania (Devonport, Tasmania, Australia)
Georgia Marble Co.　(Atlanta, Georgia, U.S.A.)
Norman Fox & Co.　(Vernon, California, U.S.A.)
Pennzoil Products Co.　(Oil City, PA,U.S.A.)
Sealand Technology Inc.　(Big Prairie, Ohio, U.S.A.)
Sunrise Coast New Zealand Ltd. (Gisborne, New Zealand)
United Exporters Co. (San Francisco, U.S.A.)