¡¡Profile
¡¡Process
¡¡History




1983. 7
YEONJISA Co. was established in Gyeyang-gu, Inchon
1984. 2
Inroduced Mold finishing stones and Honing stones
1986.10
YEONJISA Co. moved to Worl-got, Gimpo-city
1987. 7
Developed Carbon-grit stones
1989. 4
Developed water-proofing PVA abrasive stones (FBB) for a roll application
1990. 5
Introduced Internal grinding wheel for a bearing application
1990.11
Gahyun-ri Factory was opened in Gahyun-ri, Tongjin-myun, Gimpo-city
1992. 4
Introduced Super finishing stone (the first in Korea) for a bearing application
1993. 2
Developed the Diamond/Borazon-grit stones and wheels
1995. 3
Introduced new ceramic-grit stones (CT wheel)
1997. 1
Opened Sales Office in Seoul Industrial Tools Center, Guro-dong, Seoul
1999. 7
The 2nd Gahyun-ri factory was opened
2001.10
Shanghai branch was established in Shanghai, China
2001.11
The 3rd Gahyun-ri factory was opened
2001.12
Foundation of the research institute
2001.12
Introduced Super stone for mold