Mainly automatic inventory is grouped into:

• raw materials as components for the production of the finished goods;
• finished goods as the products ready for selling;
• MRO (maintenance, repair, operating supplies) stands for everything supporting the manufacturing process. What’s interesting that screws, for example, used for machinery assembling are classified as raw materials but being the spare parts for machinery repairing they are grouped like MRO;
• work-in-progress inventory items, which are the goods waiting for the next stage of processing having been produced (e.g. goods placed in the stock for quality control).

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