Detailed tariff information for Mixture of poly(1-[difluoro(trifluoromethoxy)methoxy]-1,1,2,2-tetrafluoro -2-(trifluoromethoxy)ethane) (CAS No. 69991-61-3) and Perfluoropolymethylisopropyl ether (CAS No. 69991-67-9) (provided for in subheading 3904.69.50) imports
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