Graderfan1981
Senior Member
Some manufacturers built underground grader. Fermel for example. Fermel has two types:
http://www.fermel.co.za/product.php?id=61
http://www.fermel.co.za/product.php?id=5
http://www.fermel.co.za/product.php?id=61
http://www.fermel.co.za/product.php?id=5