HB 3-7-1969 焊接衬套.pdf

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HB 5120-1979;HB 5120-1979 焊接术语.pdf

HB 5120-1979 焊接术语.pdf

HB 351-1971 焊接手柄.pdf

HB 3-22-1983 焊接卡箍.pdf

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HB 2481-1977 低支座（焊接件）.pdf

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