dongbao technology is engaged in the research and development and production of teaching demonstration equipment for petroleum engineering, training room design and construction, drilling, well recording, portable drilling simulation demonstration systems, underground tools, oil pumping machines, well control, top drive, gas production, joint stations, gas stations, oil and gas storage and transportation simulation demonstration systems and other equipment are widely used in teaching in colleges and universities across the country. _the legal representative is bi rongmao. the business scope mainly includes the cultivation, wholesale and sales of chinese herbal medicines such as chonglou, polygonatum, angelica sinensis and other chinese herbal medicines. contact number: 13887738244. _downhole tools

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dongbao technology is engaged in the research and development and production of teaching demonstration equipment for petroleum engineering, training room design and construction, drilling, well recording, portable drilling simulation demonstration systems, underground tools, oil pumping machines, well control, top drive, gas production, joint stations, gas stations, oil and gas storage and transportation simulation demonstration systems and other equipment are widely used in teaching in colleges and universities across the country.、 the legal representative is bi rongmao. the business scope mainly includes the cultivation, wholesale and sales of chinese herbal medicines such as chonglou, polygonatum, angelica sinensis and other chinese herbal medicines. contact number: 13887738244.、 what is、 popularity ranking、 leisure and entertainment、 serial number:、

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