IEC 60712-1993 Helical-scan video-tape cassette system using 19 mm (3 4 in) magnetic tape known as U-format《使用U型格式19mm(3 4 in)磁带的螺旋扫描盒式磁带录像系统》.pdf

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IEC TR 61241-2-2-1993 Electrical apparatus for use in the presence of combustible dust part 2 test methods section 2 method for determining the electrical resis.pdf

IEC TR 60972-1989 Classification and interpretation of new lighting products《新型照明产品的分类和说明》.pdf

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