A stock of spare parts which the taxpayer kept on hand for potential use in the event of machine or equipment failure did not qualify as property "to be used" for the purpose of manufacturing or processing goods for sale for the purposes of the definition of qualified property" in s. 127(10)(c)(i) of the Act (now s. 127(9)) and paragraph (a)(i) of the description of Class 29 property. McNair, J. stated (p. 6294):