Driving and lining point defiance tunnel: Fid-Bau Portal

Driving and lining point defiance tunnel

Poling boards and semi-circular shields now used in excavating this tunnel of the N. Pacific Ry. near Tacoma. (1500 w.) (No. 49070)

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Driving and lining point defiance tunnel

Poling boards and semi-circular shields now used in excavating this tunnel of the N. Pacific Ry. near Tacoma. (1500 w.) (No. 49070)

Driving and lining point defiance tunnel

Poling boards and semi-circular shields now used in excavating this tunnel of the N. Pacific Ry. near Tacoma. (1500 w.) (No. 49070)

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Document information

Title:

Driving and lining point defiance tunnel

Additional title:

Eng Rec

Published in:

Engineering Record

Publication date:

1914

Type of media:

Article (Journal)

Type of material:

Language:

English

Keywords:

Construction

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