https://www.sumitomokenki.co.jp/fileadmin/res/product/special/pdf/metal_recycle_sh330lc_sh450lh.pdf#page=9
https://www.sumitomokenki.co.jp/special/metalrecycle/https://www.sumitomokenki.co.jp/
http://www.hanamidai.co.jp/smarts/index/86/
http://www.kodaira.co.jp/products/dumptrailer/dumptrailer21.html