ICS29.035.99K15B中华人民共和国国家标准GB/T20634.4一2008电气用非浸渍致密层压木第4部分：单项材料规范由桦木薄片制成的环材Non-impregnated densified laminated wood for electrical purposes-Part 4:Specifications for individual materials-Rings produced from birch veneer(IEC 61061-3-2:2001,Non-impregnated densified laminated wood forelectrical purposes-Part 3:Specifications for individual materials-Sheet 2:Rings produced from beech veneer,MOD)2008-12-30发布2010-01-01实施中华人民共和国国家质量监督检验检疫总局中国国家标准化管理委员会发布
