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Founded in June 2005 in Chongqing, China, YAMAMOTO Chongqing Rock Drilling Machine Co. Ltd. has introduced advanced drilling machine technologies from Japan and smelting technologies and machining processes for its key components. It covers an area of more than 22,000m2, with a construction area of over 14,000m2. The Company mainly engages in research, development, production, and sales of mining machine and components. Its annual yield of air-leg rock drilling machines reaches over 50,000 sets. After a couple of year\'s elaborate investigation, our products is stable in quality, with technical specifications and performances meeting industrial standard and arriving at the national advanced level, having won the reputation of \"national trustworthy product with high quality and excellent service\". The products were regarded as a new& high-tech products as well as key new products in Chongqing in 2009, and won the promotion prize for promotional intellectual property rights in the same year.