POLYVINYLCHLORIDE PLASTISOL von STEFANOV,GECO M, BAJJRAKOV,GEORGI N, ZHELJAZKOVA,KRASIMIRA JJ, DIMITROV,DACHO T, IVANOVA,STEFKA L, ARKADIEVA,EMILIJA T, CVETKOV,KHRISTO I, CVETKOVA,ZLATKA P, BATANOVA,ZLATKA M, TASHEV,VENELIN A

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COMPOSITION OF LINOENGRAVING MATERIAL von BENCHEVA,SVETLA B, STOJANOV,MARIN A, TEOKHAROVA,VIOLETA KH, CVETKOV,KHRISTO I, CVETKOVA,ZLATKA P, STOIMENOVA,PAVLINKA K, BOZHINOVA,VERKA D

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ROTARY BAGGER BUCKET von SHEJJRETOV,KONSTANTIN T, KINOV,ANGEL D, CVETKOV,KHRISTO K

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HYDRAULIC SUPPORTING PROTECTING SYSTEM FOR CONIC CRUSHER von CVETKOV,KHRISTO K.,BG, DIMITROV,STOJJCHO K.,BG, AMOV,ALEKSAND'R B.,BG

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HYDRAULIC SUPPORTING PROTECTIVE SYSTEM OF CRUSHERS von DOJJCHINOV,SERGI L, BUNDZHULOV,VIKTOR S, LAZAROV,STEFAN D, PETROV,PETR D, CVETKOV,KHRISTO K, PANCHEV,IVAN K, CANEV,CANI K, ZLATAREV,VELIZAR I

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HYDRAULIC SUPPORTING PROTECTIVE SYSTEM FOR CRUSHERS von BUNZHULOV,VIKTOR S.,BG, CANKOV,SAVA O.,BG, PANCHEV,IVAN K.,BG, CVETKOV,KHRISTO K.,BG, IVANOV,ILIJA V.,BG, LAZAROV,STEFAN D.,BG, ZLATAREV,VELIZAR I.,BG, CANEV,CANI K.,BG, PETROV,PET'R D.,BG, DOJJCHINOV,SERGI L.,BG

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MACHINE FOR SHARPENING OF MINING BORING INSTRUMENT von TOTEV,SLAVKO KH, MRKHOV,NIKOLA B, FETVADZHIEV,GEORGI K, CVETKOV,KHRISTO K

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APPARATUS FOR TESTING OF CLAY von SHEJJRETOV,KONSTANTIN T, TOKMAKCHIEV, SVETLOZAR A, TASEV,DRAGAN KH, KINOV,ANGEL D, CVETKOV,KHRISTO K, MIKHALKOV, ZAKHARI A

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