What is the fine-grained topic of the following text: "The corporation keeps to the operation concept ""scientific management, superior quality and performance primacy, consumer supreme for 50 Portable Batching Plants , Portable Batching Plant , 50 Mobile Batching Plants , we have now complete material production line assembling line quality control system and the most importantly we now have many patents technology and experienced technical&production team expert sales service team. Only return the topic.
Quality Control and Production in a Batching Plants Corporation