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Manufacturers usually maintain making and packing machine records detailing raw materials used, production and rejects. »Ê¹ÚÌåÓýapp factory management use this information to establish standards against which production efficiency can be measured. A record of rejects, for each making and packing machine, is usually kept at the factory. »Ê¹ÚÌåÓýappse records are used to establish the normal range of results (the efficiency) of each machine. Any deviation from the established pattern should be investigated and resolved by the trader. This is because falsified reject figures could be used to hide the abstraction of materials or finished product.