青龙管业：青龙控股、陈家兴合计解除质押813万股

Group 1 - The core point of the article is that Qinglong Pipe Industry announced the release of share pledges by its controlling shareholder, Qinglong Technology Holdings, involving a total of 8.13 million shares [2] - Qinglong Pipe Industry's revenue composition for the year 2024 is as follows: 84.64% from non-metallic mineral products, 15.32% from water conservancy technology services, and 0.04% from other businesses [2]