Technical progress in the mechanization of roadway drivage in coal and stone increase in the share of roadways driven by heading machines / transmitted by the Government of the Federal Republic of Germany.
1983
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Details
Symbol
[E/ECE/]COAL/GE.1/R.50/Add.3
Title
Technical progress in the mechanization of roadway drivage in coal and stone increase in the share of roadways driven by heading machines / transmitted by the Government of the Federal Republic of Germany.
Authors
Date
Geneva : UN, 20 Apr. 1983.
Description
9 p.