**Business Goal-Adopt new conceptual technology for realizing visual aids-Increase customer satisfaction through improvement service-Expand the business with a thorough challenging spirit-Realizing cutting-edge digital classroomProvision ...

1974. 04.20 : Established Sam-Jung Steel Industry -PC bridge cone, sheath duct, spiral, steel wire etc. 1986. 01. 01 Converted to Corporation wedge, bearing shoe1990. 02. 02 Review of Wedge specification -Reliability and endurance test1990. 05. Changed a ...