Tianrui Weifang Heavy Industrial Rock Drilling Corporation is a high-tech and star enterprise specialized in the research and development of the rock drilling machinery and pneumatic tools in Shandong Province, supported by the state venture funds of Ministry of Science and Technology for science-based small and medium enterprises.Under the leadership of senior Engineer with the rank of a professor ,our R&d team have enjoyed government particular subsidy and account for 20% of the total in our company which honoured as elite innovation team by the municipal government. Our company have...