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Tunnel shields, Central London railway
Describes special features of shields 12.5 and 22.8 feet in diameter used in tunneling clay and marl under 20 pounds air pressure. (800 w.)
Tunnel shields, Central London railway
Describes special features of shields 12.5 and 22.8 feet in diameter used in tunneling clay and marl under 20 pounds air pressure. (800 w.)
Tunnel shields, Central London railway
Eng Rec
1898
Aufsatz (Zeitschrift)
Englisch
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Shields for tunnel construction
Engineering Index Backfile | 1893
Engineering Index Backfile | 1890
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Engineering Index Backfile | 1897
Engineering Index Backfile | 1898