In section 13(1) of the [1966 c. 34.] Industrial Development Act 1966 and section 14(1) of the [1966 c. 41 (N.I.).] Industrial Investment (General Assistance) Act (Northern Ireland) 1966, in the definition of " hover vehicle ", for the words from " a vehicle " onwards there shall be substituted the words " a hovercraft within the meaning of the Hovercraft Act 1968 and includes part of such a hovercraft ".