APPARATUS TO HEAT AIR IN MINES von BOBROVNIKOV VLADIMIR NIKOLAEVICH, MOZHEEV GRIGORIJ GRIGOREVICH, VASILEV ALEKSANDR PAVLOVICH, GENDLER SEMEN GRIGOREVICH, SHUSHAKOV ANATOLIJ MIKHAJLOVICH, FERKHO IGOR ADOLFOVICH, SHUVALOV YURIJ VASILEVICH, GANOVICHEV ARTEL IVANOVICH

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