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第一台现代硬岩隧道掘进机
1952年，詹姆斯. 罗宾斯先生为美国南达科塔州奥瓦希坝(Oahe Dam)项目设计并制造了世界上第一台硬岩隧道掘进机。这台设备应用鱼尾刮刀和哑铃型刀具成功在困难的页岩地质开挖隧道。
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