In this paper, a preventive maintenance model which generalize Barlow, Glasser and Morse's models respectively are constructed, and the optimal inspection period for the model are obtained. Barlow [1] proposed policy I and policy II for two types of preventive maintenance model in 1960, and afterward Makabe and Morimura [3] modified policy II and called it policy III. Model treated in this paper concerns with policy I ; while in Barlow's model of policy I, optimal preventive maintenance policy which maximizes limiting effeciency is obtained, in this paper policy which maximizes total revenue is discussed.
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