Assadej Vanichchinchai และ Wanwisa Duantrakoonsil. (2018) Quality improvement of printed circuit board: A case study of copper in hole. <i>Science, Engineering and Health Studies</i>, <i>12</i>(2), 77-84.Assadej Vanichchinchai และ Wanwisa Duantrakoonsil. "Quality improvement of printed circuit board: A case study of copper in hole". Science, Engineering and Health Studies 12 (2018):77-84.Assadej Vanichchinchai และ Wanwisa Duantrakoonsil. Quality improvement of printed circuit board: A case study of copper in hole. Silpakorn University Research and Development Institute:ม.ป.ท. 2018.