@misc{Spies_Klaus_The, author={Spies, Klaus}, howpublished={online}, publisher={Wydawnictwo Politechniki Śląskiej}, language={eng}, title={The influence of the original technical concept and constant changes in perceptible needs on the reliability and durability of machines, instruments and systems in underground coal mining}, type={artykuł}, keywords={Politechnika Śląska, górnictwo, przemysł górniczy, technika górnicza}, }