Under the sales tax legislation (Assessment Act (No. 1), s. 11(1)), a person who becomes a "manufacturer" or "wholesale merchant" must, "within 28 days" thereafter, become registered. A "manufacturer" is defined (Assessment Act (No. 1), s. 3(1)) as "a person who engages, whether exclusively or not, in the manufacture of goods ". A "wholesale merchant" is defined in the same sub-section as "a person who engages, whether exclusively or not, in the sale of goods by wholesale ". The sales tax legislation is framed on the basis that the relevant manufacturing or wholesaling activities can be identified as a "business". Thus, the penalty for a failure to become registered (Assessment Act (No. 1), s. 13) is imposed upon a "person carrying on business as a manufacturer or as a wholesale merchant". Even more in point, the legislation is framed on the basis that registration relates to a particular manufacturing or wholesale business. In particular, s. 16 of Assessment Act (No. 1), which provides for cancellation of a certificate of registration, is limited to the case where the manufacturer or wholesale merchant "ceases to carry on the business to which the certificate [of registration] relates". In that legislative context, the reference to sale by a registered person or by a person required to be registered in ss. 4(1) and 5 of the relevant Assessment Acts can readily be read as connoting a sale in the course of the particular business from the carrying on of which the obligation to become registered arises and to which, when he is registered, the certificate of registration "relates". If it be relevant, the Regulations appear to go further and to assume that a distinction can, at least for the purposes of registration, be drawn between parts of one business carried on in different States: see, e.g., regs. Pt II and reg. 12(1)(e).