PL286146A1 - Method of and apparatus for loosening and/or mining minerals in particular coal, and consolidated materials by means of compressed air
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Method of and apparatus for loosening and/or mining minerals in particular coal, and consolidated materials by means of compressed air
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Application filed by Mecseki Sz Nbanyak, Ipari Technologiai Int ZetfiledCriticalMecseki Sz Nbanyak
Priority to PL28614690ApriorityCriticalpatent/PL286146A1/en
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PL28614690A1990-07-201990-07-20Method of and apparatus for loosening and/or mining minerals in particular coal, and consolidated materials by means of compressed air
PL286146A1
(en)