``Domestic interested party'', when used in this part, means:
(a) A manufacturer, producer, or wholesaler in the United States of a like product,
(b) A certified union or recognized union or group of workers which is representative of an industry engaged in the manufacture, production, or wholesale in the United States of a like product, or
(c) A trade or business association a majority of whose members manufacture, produce, or wholesale a like product in the United States. [T.D. 80-271, 45 FR 75642, Nov. 17, 1980]