DRY PROCESS FOR PRODUCTION OF QUARTZ GLASS CONCENTRATE von KHARKOVER ISAK, VOROB'EV VLADIMIR VASIL'EVICH, IVANOV EVGENIJ NIKOLAEVICH, BORODAVKO VLADIMIR IVANOVICH, SHPEKTOR VLADIMIR BORISOVICH

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METODO PER RICUPERARE SABBIE DA MISCELE USATE DI FONDERIA E SISTEMA PER ESEGUIRE LO STESSO von KRAKOVSKY EVSEI BORISOVICH, ABROSIMOV VYACHESLAV PETROVICH, KNORRE IGOR NIKOLAEVICH, SHISHKIN IGOR MIKHAILOVICH, KHALFIN FANIS BARIEVICH, GAN IGOR SERGEEVICH, SAFRONOV VIKTOR ALEXEEVICH, TABAK JURY BORISOVICH, TOROVIN ALEXANDR VIKTOROVICH, ZAYAKIN SERGEI NIKOLAEVICH, FISHKINH EFIM IZRAILEVICH, MIRONOV JURY FADEEVICH, ONUFRIEV INNOKENTY ALEXANDROVICH, BEKH NIKOLAI IVANOVICH, SHPEKTOR ANATOLY ALEXANDROVICH, SKORNYAKOV VLADIMIR NIKOLAEVICH

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