1-This Section does not cover: (a) Transmission or conveyor belts or b elting, of plastics of Chapter 39, or of vulcanised rubber (heading 40 .10); or other articles of a kind used in machinery or mechanical or e lectrical appliances or for other technical uses, of vulcanised rubber other than hard rubber (heading 40.16);(b) Articles of leather or of composition leather (heading 42.05) or ...............................