GOST 16072-1970 Union elbows screwed for tube connections on internal cone Construction and dimensions《内圆锥管路连接用旋入式弯头 结构及尺寸》.pdf

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GOST 16074-1970 Union tees screwed for tube connections on internal cone Construction and dimensions《内圆锥管路连接用旋入式三通 结构及尺寸》.pdf

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