Prosecutors demanded a 10-year prison term Monday for Yasuo Hamanaka, a former Sumitomo Corp. trader, for inflicting losses of about $770 million on his firm through illicit copper trading.

Hamanaka, 49, has been charged with fraud and forging documents. The defendant has admitted to most of the charges brought against him, and the Tokyo District Court is expected to end hearings in the case after the final argument by the defense Feb. 25.

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