Mr. Lieng TengAmnuay as a grocery store. Fifteen years later, Mr. Kian TengAmnuay (Mr. Lieng's son) started pharmaceutical sales business by turning the grocery partly into drugstore. In 1956, the business:

- Ouiheng Consumer Co.,Ltd.
- Greater Pharma Ltd. Part.
- Greater Poly Manufacturing Co.,Ltd.
- Grand Poly Industry Co.,Ltd.
- Grand Interprint Co.,Ltd.