Sumitomo is a construction machinery manufacturer of the Sumitomo Group with a history of more than 400 years. In 1967, the first hydraulic excavator was developed with its own technology. He has received the "Good Design Award" from the Japan Industrial Design Promotion Association and the "Energy Conservation Award" sponsored by the Ministry of Economy, Trade and Industry. The first impression of Sumitomo excavator is that it is stable, the overall quality is excellent, the digging force is strong, and the comfort is good. The fly in the ointment is that the fuel consumption is average, the follow-up investment is high, and the cost performance is medium.