最終更新日：2024/08/06
The Welsbach mantle is a type of gas mantle used in gas lamps.
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The Welsbach mantle is a type of gas mantle used in gas lamps.
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The Welsbach mantle is a type of gas mantle used in gas lamps.
The Welsbach mantle is a type of gas mantle used in gas lamps.
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