212型シールと204型シールには本質的な違いがありますか？具体的にどのような違いがあるのでしょうか？
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212機封と204機封の違いは何ですか？すべて多スプリング、単一端面、バランス型、外部搭載式
構造的特徴が異なる。204：小さなスプリング、212：テトラフルオロエラストマーチューブ
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