Mar. 1986.
Established with a name 'YungPoong Co., Ltd.(parent company of Big Stone)'.
322D model developed.
OEM business started with Furukawa, Japan.
Become official supplier of Korea Coal Organization : 322D
Feb. 1993.
324D(TY24LD) model developed.
OEM business started with TOYO, Japan.
Become the exclusive supplier of pneumatic rock drill in entire South Korea.
Jan. 1996.
Become a supplier of rock drill parts for Yamamoto, Japan.
Jan. 2001.
Company name changed Big Stone Rock Drill Co., Ltd.
Jan. 2005.
SANDVIK Sweden took over TOYO, Japan.
Countinue OEM business with SANDVIK-TOYO.
Dec. 2010.
OEM contract with SANDVIK-TOYO finished.
June. 2011.
Developing Big Stone's own overseas sales and distributor over the world.
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