杭氧股份(002430.SZ)：已为国内多个航天发射场提供液体空分设备及液体产品，相关收入占比较小

Group 1 - The company has provided liquid air separation equipment and liquid products to multiple domestic aerospace launch sites, indicating its involvement in the aerospace sector [1] - The revenue generated from these aerospace-related activities is relatively small compared to the company's overall income [1]