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74.12 ‑ Copper tube or pipe fittings (for example, couplings, elbows, sleeves).
The Explanatory Note to heading 73.07 applies, mutatis mutandis, to this heading.
The heading does not cover :(a) Bolts and nuts used for assembling or fixing pipes or tubes (heading 74.15). (b) Fittings with taps, cocks, valves, etc. (heading 84.81).
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제15부 비(卑)금속과 그 제품
> 제74류 구리
> 제7412호 관연결구류 
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