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This is thesis concerned with the inventory has deteriorating character in aimed area as Republic of Yemen where the collected data of the study area consist of the two types of deteriorating items as first the deteriorating item which it has only the deterioration character second one the item has two characters as deterioration and break-ability rates simultaneously

This is thesis concerned with the inventory has deteriorating character in aimed area as Republic of Yemen where the collected data of the study area consist of the two types of deteriorating items as first the deteriorating item which it has only the deterioration character second one the item has two characters as deterioration and break-ability rates simultaneously, so that there are many inventory models both first and second especially if there was assumed that the inventory level, not equal zero before any replenishment, the important thing the proposed models for inventory are developed in a general way for any inventory satisfied the assumptions and conditions