1. “Marine plywood” means plywood conforming to Indian Standard Specification IS : 710-1976.

2. “Aircraft plywood” means plywood conforming to Indian Standard specification Nos. IS:709-1974 and IS: 4859-1968.

3. For the purposes of heading 4412, the expression “similar laminated wood” includes blockboard, laminboard and battenboard, in which the core is thick and composed of blocks, laths or battens of wood glued or otherwise joined together and surface with the outer plies and also panels in which the wooden core is replaced by other materials such as a layer of layers of particle board, fibre board, wood waste glued or otherwise joined together, asbestos or cork.