GB 4644-1984 单边片孔单条16mm影片的磁性声带的录音与还音磁头的隙缝位置和宽度尺寸.pdf

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GB T 4644-1984 单边片孔单条16mm影片的磁性声带的录音与还音磁头的隙缝位置和宽度尺寸.pdf

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