Explanatory notes
… a basis of oil, grease, wax, paraffin wax, graphite, tar or bitumen. (3) Removal of small portions of the metal for … also covers : (1) Bars and rods which are rolled with protuberances or indentations (e.g. teeth, grooves, … after rolling, e.g., bars which are rolled with two or more longitudinal flanges, which are given a spiral form by …