严禁用绳套絷人操作 Yanjin yong sheng tao zhi ren caozuo 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 E37/278 Collection Landsberger collection