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An Economic Evaluation of Two Mechanized Shaft Sinking Concepts: the Blind Shaft Borer and the Large Diameter Drill.

Authors
Anonymous
Source
NTIS: Fe/2623
Link
NIOSHTIC No.
10001080
Abstract
MISSING
Document Type
CP; Final Contract Report;
NTIS Accession No.
FE/2623
NTIS Price
Identifying No.
Contract - C-2623
NIOSH Division
WO;
Source Name
NTIS: Fe/2623
Performing Organization
Trw Energy Syst. Plan. Div.
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