IRAM 652-1953 《非冷铁制金属方形框架（尺寸）》.pdf

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IRAM 648-1953 《非冷铁制金属六边形框架（尺寸）》.pdf

IRAM 651-1953 《非冷铁制金属方形框架（尺寸）》.pdf

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