Which Tianjin has the first-class qualification of blasting?

Tianjin Mining Engineering Co., Ltd. According to official website's inquiry, Tianjin Mining Engineering Co., Ltd. is a professional and integrated first-class qualification service enterprise engaged in mine shaft engineering construction and mining services. Founded in 1965, it now has more than 30 branches and project departments. It has the first-class qualification of mine engineering construction general contracting, the second-class qualification of electromechanical engineering construction general contracting, the second-class qualification of tunnel engineering professional contracting and steel structure engineering professional contracting, the first-class qualification of commercial blasting operation license and the first-class qualification of blasting.