網状バルブ
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網状弁の弁板と緩衝板の間の距離は現在およそどれくらいでしょうか？皆様、ご教示ください
こんなバルブは見たことがないんですが、よければ写真をいくつか送ってもらえますか？
写真を送ってみてよ、勉強しよう*
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