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BS 4872-2-1976 Specification for approval testing of welders when welding procedure approval is not required - TIG or MIG welding of aluminium and its alloys.PDF

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焊接程序不要求時焊工的鑒定考試規范-鋁及其合金的TIG或MIG

BS 4872-2-1976 Specification for approval testing of welders when welding procedure approval is not required - TIG or MIG welding of aluminium and its alloys

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