The registrant, a jeweller, purchased gold bars with 99% purity on an exempt basis, and then cut the bars (sometimes with further modeling or rolling) into smaller rectilinear pieces, which it then sold to customers without charging GST. After noting the reliance by the registrant on the ordinary dictionary meanings of "bar," "ingot" and "wafer," Margenson J found that these terms should be given their technical rather than ordinary meaning. Accordingly, the pieces were required to have a readily ascertainable value, in order that they generally were readily transferable.