'Tube Tunnel Excavation By Means of Greathead Boring Shield', c1930. Creator: Unknown.

'Tube Tunnel Excavation By Means of Greathead Boring Shield', c1930. Creator: Unknown.

2-710-170 - The Print Collector/Heritage Images

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'Tube Tunnel Excavation By Means of Greathead Boring Shield', c1930. From "The Wonder Book of Engineering Wonders", edited by Harry Golding. [Ward, Lock & Co., Limited, London and Melbourne]

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