[4] Exemption from registration to wholesale traders or dealers,brokers, commission agents, curers of unmanufactured products except curers of coffee and persons who obtain excisable goods except under Excise Rule 192. — In exercise of the powers conferred by sub-rule (2) of rule 174 of the Central Excise Rules, 1944, the Central Board of Excise and Customs, hereby specify the following persons who need not obtain registration under the said rule, namely :-