1. Overview 
● A technology for producing circulating aggregates for concrete using two drum crushing mills, the first of which performs comminution and the second grinding and shape improvement, installed in a series with varying densities and leads of spiral protrusions formed on the fixed liner.

● Issuance Classification(Effective Term) : March 24, 2016- March 21, 2021
● Waste(large classification) > Construction material disposal(Small classification)