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Precious metal refiner Chugai Mining Co. said Monday it has agreed to purchase a 21 percent stake in U.S. optic technology venture company Katsina Optics Inc. for $7 million in an effort to meet the growing demand for swift, inexpensive fiber-optic network-related services.

Chugai Mining said it will also extend loans worth $3 million to the California-based Katsina Optics.

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