74102 -With backing: HS code chinese tariffs

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741021 Refined copper foil backing, thickness (excluding backing) ≤ 0.15mm Refined copper foil backing, thickness (excluding backing) ≤ 0.15mm

741022 Copper alloy foil with backing, thickness (excluding backing) ≤ 0.15mm Copper alloy foil with backing, thickness (excluding backing) ≤ 0.15mm