175.3—Domestic interested party.
         “Domestic interested party”, when used in this part, means:
    
    
    
        
        (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.