千斤上顶卡瓦必须用绳絷牢 Qianjin shangding kawa bixu yong sheng zhi lao 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 54x78 cm. Call nr. BG E37/281 Collection Landsberger collection