Shield holds ceiling and wall in place
The tunnel shield was made up of 36 cast-iron frames
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The tunnel shield was made up of 36 cast-iron frames
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Cabins & Cottages, Revised & Expanded Edition: The Basics of Building a Getaway Retreat for Hunting, Camping, and Rustic Living
bySkills Institute PressEbook
Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Reinforced Concrete Pier Construction
byEugene KlappEbook
Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Site of the Terminal Station. Paper No. 1157
byGeorge C. ClarkeEbook
Transactions of the American Society of Civil Engineers, Vol. LXX, Dec. 1910 A Concrete Water Tower, Paper No. 1173
byA. Kempkey