The registration address of the east ironko experimental instrument limited is at no. 329, guo zhang town, jiuzhou city, hebei province. The registration authority is the managing authority for the contribution to the district market, represented by a legal person, yang ning, and operates on general items: sale of instrument instruments; repair of instruments; sale of construction materials. (in addition to projects subject to authorization under the law, the operation of the business is carried out autonomously under a licence)