推放吊钳不要退猛以免打人 Tuifang diaoqian buyao tui meng yi mian da ren Designer Sichuan Petroleum Administration Bureau of Drilling (四川石油管理总局钻探局) Date early 1950s Publisher First Printing Factory of the Northwest Military Region (西北軍區第一印刷廠) Size 78x54 cm. Call nr. BG E37/284 Collection Landsberger collection Tags China poster Chinese propaganda safety tongs oil