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Search for: [Subject and Keywords = czasopismo polskie] OR [Subject and Keywords = górnictwo] OR [Subject and Keywords = inżynieria] OR [Subject and Keywords = patenty] OR [Subject and Keywords = robotnicy] OR [Subject and Keywords = technika] OR [Subject and Keywords = wynalazki] OR [Title = Biuletyn Wynalazczości Przemysłu Węglowego \: czasopismo poświęcone zagadnieniom wynalazczości i usprawnień. R.1, 1949, Nr 6\-7]

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