焊工工作前应做好检查 Hanggong gongzuoqian ying zuohao jiancha Designer Designer unknown (未知) Date late 1970s Publisher Liaoning hangkong gongye laodong baowei xuanchuan jiaoyu zhongxin (辽宁航空工业劳动保护宣传教育中心) Size 77x54 cm. Call nr. BG E37/241 Collection Landsberger collection Link to IISH catalog https://search.iisg.amsterdam/Record/1455327
