... five subsidiaries: Chumboon Iron-Printing & Tin-Making Co., Ltd, set up in 1992 Nanhai Chumboon Iron-Printing and Tin-Making Co ... ., Ltd, set up in 2005 Guangzhou Chumxin Metal Products Co., Ltd, set up in 2010 Tianjin Chumboon Iron-Printing ... & Tin-Making Co., Ltd, set up in 2010 Guangzhou Chumboon Import ...