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
Detalles de los registros
Signatura[E/ECE/]COAL/GE.4/R.18
TítuloCoal-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.
AutoresPoland
FechaGeneva : UN, 26 Oct. 1981.
Descripción
3 p.