新型超长、超粗暨高性价比重型螺纹连接钎杆的研发
신형초장、초조기고성개비중형라문련접천간적연발
R&D of Innovative, Heavy-Duty Thread Extension Steel Bars for Rock Drilling Which are Ultra-Long, Ultra-Thick and of High Price/Performance Ratio
저자의 최근 논문