IP 및 인증서 카테고리 전체열린 분류 patentscertificates 5 briquette iron manufacturing device(no.10-20077689) 4 briquetting machine(no.10-1244820) 3 segment press tool(no.10-1040523) 2 method of manufacturing a non-binding molded coal(no.10-0923286) 1 patent certificate(no.10-1817034)