Circular No. 368/1/98-CX Attention is invited to Board”s Circular No. 315/31/97-CX dt. 23.5.97 regarding classification of Ready Mix Concrete. It has been brought to the notice of the Board that in some cases concrete mix manufactured at the site of construction is being denied exemption under S.No. 51 of Notification No. 4/97 dt. 1.3.97.