参考文献:
Penning, Thomas D. Thomas, Sheela A. Zhu, Gui-Dong Gong, Jianchun Giranda, Vincent L. Gandhi, Viraj B. Patent: US27/247 A, 27 Location in patent: Page/Page column 5-6
参考文献:
Bartkovitz, David Joseph Chu, Xin-Jie Liu, Jin-Jun Morgan Ross, Tina Zhang, Zhuming Patent: US2/86854 A, 2 Location in patent: Page/Page column 44