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May. 1984 : Oh Sung Trading Co., Ltd. Established.
Jun. 1989 : Conclude Exclusive Distributor and Agentship with
Kett Electric Laboratory in Japan.
Feb. 1992 : Korea Kett Sales Co. Established.
Feb. 1992 : Conclude Exclusive Distributor and Agentship
with Zeltex Inc. in U.S.A.
Aug. 1994 : Korea Kett Engineering Co., Ltd. Established.
May. 2001 : Continue..
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