Kueadoung, Amornthep, Krerkchai Thongnoo2, and Booncharoen Wongkittisuksa. 2012. “Study of Optical Wrist Strap Engagement Detector for Hard Disk Assembly Process”. Engineering and Applied Science Research 34 (4):451-58. https://ph01.tci-thaijo.org/index.php/easr/article/view/1835.