中远海发：公司集装箱制造业务主体是所属上海寰宇物流装备有限公司

Group 1 - The core business of the company is container manufacturing, primarily conducted through its subsidiary, Shanghai Huanyu Logistics Equipment Co., Ltd. [1] - The sales revenue of the company mainly comes from the sales of containers, indicating a strong focus on this segment [1] - Major customers of the container manufacturing segment include leading global shipping companies and container leasing firms [1]