GOST 21765-1976 Self-opening threadcutting die heads with circular Technical conditions《带圆梳形板牙自动张开式板牙头 技术条件》.pdf

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GOST 21760-1976 Self-opening threadcutting die heads with circular chasets Tipes and main dimensions《带圆梳形牙板自动张开式板牙头 型式及基本尺寸》.pdf

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