... consists of five subsidiaries: -. Chumboon Iron-Printing & Tin-Making Co., Ltd, set up in 1992 -. Nanhai Chumboon Iron-Printing ... in 2005 -. Guangzhou Chumxin Metal Products Co., Ltd, set up in 2010 -. Guangzhou Chumboon Tinplate Trading Co., Ltd, set up in 2006 -. ... Tianjin Chumboon Iron-Printing & Tin-Making Co., Ltd, set up in ...