先生、説明してください
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HG20594-97とHG20616-97の違いは何ですか？
HG20616-1997 ネック付き溶接用鋼製管フランジ（アメリカ規格） HG20594-1997 ネック付き溶接用鋼製管フランジ（ヨーロッパ規格）
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