headspan wire 中文意思是什麼
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Fittings for overhead contact system of electrification railway - part 3 : clamp for headspan cross messenger wire
電氣化鐵道接觸網零部件第3部分:橫承力索線夾 -
Fittings for overhead contact system of electrification railway - part 4 : clamp for double headspan cross messenger wire
電氣化鐵道接觸網零部件第4部分:雙橫承力索線夾
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