Central Excise exemption wording amended: 'whether vulcanized or not' replaced by 'and unvulcanized' in relevant notification. Amendment to Notification No. 71/68-C.E. substitutes the words 'whether vulcanized or not' with the words 'and unvulcanized', effected under the powers of section 5A(1) of the Central Excises and Salt Act, 1944, thereby changing the descriptive wording in the tariff exemption entry.