Here are the ones, that I know of...
(and without the joint ventures such as Yantai Perzina, Beijing Heintzman, Pearl River/Yamaha, and Xinghai/Kawai)

Guangzhou Pearl River (

Beijing Xinghai (

Dongbei (

Shanghai Yue Yin Piano ( or

Shanghai Piano Co. (Strauss) (

Shanghai Ying Man Piano Co. (

Shanghai Artfield Piano Co. (

Yantai Longfeng Pianoforte (

Hangzou Goodway Piano Co. (

China Fujian Aiyue Piano Co. (

Nanjing Moutrie Piano Co. (

Qingdao Sejung (

Dalian Atlas Instrument Co. (

Please feel free to correct and/or contribute to the list.. \:\)