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
تفصيلات التسجيلة (السجل)
رمز / رقم الاستدعاء[E/ECE/]COAL/GE.4/R.18
العنوانCoal-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.
المؤلفونPoland
تاريخGeneva : UN, 26 Oct. 1981.
الوصف
3 p.