STAS 111200 78-1978 Graphical symbols GRAPHICAL SYMBOL FOR STEREOPHONIC HEADPHONES《图形符号 立体声耳机的图形符号 》.pdf

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SJ T 9563-1995 立体声耳机质量分等标准.pdf

SJ T 9563-1995 立体声耳机质量等分标准.pdf

ECA 331-1966 Stereophonic Headphones with 3-Contact Plugs Polarization of《有三向插头的立体声耳机的极化》.pdf

GOST 28278-1989 Stereophonic headphones Methods of measurements《立体声耳机 测量方法》.pdf

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