Coal-getting systems not requiring the presence of men at the face at all times and methods of working coal which do not require the presence of men underground / transmitted by the Government of Poland.
1981
Полное описание
Условное обозначение[E/ECE/]COAL/GE.4/R.18
ЗаглавиеCoal-getting systems not requiring the presence of men at the face at all times and methods of working coal which do not require the presence of men underground / transmitted by the Government of Poland.
АвторыPoland
ДатаGeneva : UN, 26 Oct. 1981.
Описание
3 p.