Corvus Systems Inc., San Jose, has announced several board-level appointments, headed by the election of President Lewis T. Lipton, 47, to the board and his appointment to the additional position of chief executive, effective immediately. He succeeds James L. Siehl, who resigned as CEO for personal reasons.

Corvus also appointed Roger L. Mosher, 57, chairman. He has been a board member since August, 1985. Executive Vice President Joseph W. Rooney, 58, has been also given responsibility for worldwide marketing and sales operations.

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