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1 review of Joy Mining Machinery I was not happy with the design engineer I encountered from Joy Mining and Machinery. He was a know it all and yet he seemed to lack some common knowledge. For example, who checks the transmission dip stick to see if the oil is low? Scary. Komatsu Mining Corp. offers industrial mining equipment through its PH, Joy, Montabert and Komatsu brands. Our mining products, services and technologies help customers throughout the mining industry improve safety and productivity at operations worldwide.