Sinomachine Heavy Industry is a group formed by Tianjin Dingsheng, Luoyang Construction Machinery and Changzhou Forestry Machinery. Due to the overlapping business between its subsidiaries, there is obvious competition in the industry, so the future development ideas are also centered around solving problems among peers. Competition has given full play to the group's advantages and formed a structure of one center and three bases, that is, setting up a technology research and development center (most likely in Beijing or Tianjin) and three assembly plants (Tianjin grader, Luoyang roller, Changzhou loader).
Judging from the above situation, the bureau-level units mentioned by the poster do not have much reference significance when measuring such production-oriented enterprises.