Central Excise and Salt Act (1 of 1944) , S.3— Excise duty - Claim of exemption on ground machinery installed is immovable property attached to earth - Owner installing paper making machine - Tribunal finding that machine was attached to the earth for operational efficiency - Tribunal also finding that machine could be sold by dismantling it and selling its parts - Plea that whatever is embedded in earth must be treated as immovable property - Not basically sound further, just because plant and machinery had to be installed in earth for better functioning it does not automatically become immovable property - Property is liable to excise duty. General Clauses Act (10 of 1897) , S.3(26)— (Para 4 5)