BANGKOK, April 29 (Reuters) - Siam Cement Pcl :
* Thailand's top industrial conglomerate says a subsidiary has agreed to buy a majority stake in PT Keramika Indonesia Asosiasi Tbk , an Indonesian ceramic maker.
* Another subsidiary of Siam Cement also plans to acquire a stake in PT Kokoh Inti Arebama Tbk , an Indonesian building materials distributor
* It gave no details on the cost of the acquisitions. (Reporting by Arada Kultawanich)