向技术革新要电，降低产品电耗 Xiang jishu gexin yao dian, jiangdi chanpin dianhao Designer Designer unknown (未知) Date early 1970s Publisher Guangdong Provincial Revolutionary Committee Third Electricity Office (广东省革命委员会三电办公室) Size 53x19 cm. Call nr. BG D25/277 Collection Landsberger collection
