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116 . , 53, .I , , , 2010 ANNUAL of the University of Mining and Geology St. Ivan Rilski , Vol. 53, Part , Mechanization, electrification and automation in mines, 2010 ( ) 1, 2 1 . , 1700 E-mail: 2 . , 1700 E-mail: . ( ) . , ( ).
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