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UNE 56534:1977 PHYSICAL-MECHANICAL CHARACTERISTICS OF WOOD. HARDNESS DETERMINATION.
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UNE 68038:1977 AGRICULTURAL TRACTORS. USE OF UNITIES SI.
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UNE 38602:1977 WROUGHT MAGNESIUM ALLOYS. COMMERCIAL EQUIVALENCES.
UNE 38623:1977 WROUGHT MAGNESIUM ALLOYS. GROUP MG-TH. ALLOY L-6511 MG-3 TH ZR.