最終更新日：2022/12/24
Here the protection consists of a 50lb per mile cadmium copper trip-wire mounted on short telegraph posts on both sides of the line, 4ft above rail level.
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Here the protection consists of a 50lb per mile cadmium copper trip-wire mounted on short telegraph posts on both sides of the line, 4ft above rail level.
DiQt（ディクト）
無料
★★★★★★★★★★
