厦工股份：控股子公司厦门厦工中铁重型机械有限公司的主要产品为盾构机

Group 1 - The core point of the article is that Xiamen XGMA Heavy Machinery Co., Ltd., a subsidiary of XGMA Co., Ltd. (stock code: 600815.SH), produces shield tunneling machines [2][3] Group 2 - Investors inquired about the presence of shield tunneling machines in XGMA's product line [2] - XGMA confirmed that its subsidiary specializes in manufacturing shield tunneling machines [2]