Section 1
Where in column (2) of this Schedule, the description of an article or group of articles under a heading is preceded by "-", the said article or group of articles shall be taken to be a sub-classification of the article or group of articles covered by the said heading. Where, however, the description of an article or group of articles is preceded by "--", the said article or group of articles shall be taken to be a sub-classification of the immediately preceding description of the article or group of articles which has "-". Where the description of an article or group of articles is preceded by "---" or "----", the said article or group of articles shall be taken to be a sub -classification of the immediately preceding description of the article or group of articles which has " -" or " --".