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Wojciech Podgorski
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Bytom, PL
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Patent Grant
Device for mining of thick strata of useful minerals
Patent number
4,240,666
Issue date
Dec 23, 1980
Centralny Osrodek Projektowokonstrukcyjny Maszyn Gorniczych KOMAG
Wojciech Podgorski
E21 - EARTH DRILLING MINING