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
详细记录
符号[E/ECE/]COAL/GE.1/R.50/Add.3
标题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.
日期Geneva : UN, 20 Apr. 1983.
描述
9 p.