JANUARY, 1989 :
SIAM TONE Co., Ltd. was established as a joint Venture between Tone Corporation, Mitsiam International Ltd. Siam Industrial Corp. Ltd. and Mitsui & Co., Ltd. as a foundation contractor for buildings etc.

APRIL 1990 :
Technical transfer agreement was signed with Tone Corp. on the total method of construction.

NOVEMBER, 1990 :
Business collaboration agreement was signed with Nippon Hume Concrete (Thailand) Co., Ltd. on Noiseless and Vibrationless PC piling method.

APRIL, 1991 :
Bangpakong factory was constructed and production of boring machines was started as the first manufacture in Thailand.

AUGUST, 1991 :
Purchase water well drilling rigs model “TOP-300”

NOVEMBER, 1991 :
Produced Spindle type boring machine model “THC-1”

JANUARY, 1992 :
Produced Mud Pump model “NA-60” and grouting work was started.

JULY, 1992 :
Thai Industrial Standard was given to water well rigs model “TOP-300”

JICA PROJECT, 1993 :
Geotechnical Investigation of land subsidence in Bangkok and Vicinity.

JICA PROJECT, 1994 :
Water well drilling and development in Vientiane province, Laos.

JICA PROJECT, 1995 :
Hydrogeological study and test hole drilling and development in Champasak province, Laos.

JICA PROJECT, 1996 :
Japanese Team for Sageguarding, Ankor, Siem Reap, Cambodia.