Please refer to the relevant link(s) below for details.
1)MLIT Logo and others
http://www.mlit.go.jp/page/kanbo01_hy_002581.html (in Japanese).
http://www.mlit.go.jp/page/kanbo01_hy_002584.html (in Japanese).
2)Part of Japanese page
http://www.mlit.go.jp/page/kanbo01_hy_003657.html (in Japanese)