Group 1 - The company Meian Sen (300275.SZ) has confirmed that its subsidiary, Chongqing Weian Measuring Instrument Manufacturing Co., Ltd., has joined the "Guohe No. 1" industrial chain [2] - Investors are encouraged to seek further details directly from Weian Measuring Instrument [2] - The inquiry was made on an investor interaction platform, indicating active engagement with shareholders [2]