维护费用总和。它们包括人员，材料，消耗品等的成本。如果在本公司内部进行维护，则必须将房间成本和按比例分配的间接费用以及自己商店的使用作为基本决策标准。

        Sum of the costs incurred by maintenance. They comprise cost for personnel, material, consumables, etc. If maintenance is carried out within the own company, the room costs and the prorated overhead costs as well as the utilisation of the own shop must be considered as essential decision criteria.