参考文献

Kowa Company, Ltd.; OHGIYA Tadaaki; MURAKAMI Takeshi; MIYOSAWA Katsutoshi; SHIBUYA Kimiyuki; YAMAZAKI Koichi; KUSAKABE Taichi Patent: EP2578574 A1, 2013 ; Location in patent: Paragraph 0116; 0117; 0118; 0119 ;