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Patent Office of the Republic of Poland – www.uprp.pl/wynalazki-i-wzory-uzytkowe/Lead05,22,1691,4,index,pl,text/
Patent Office of the Republic of Poland – www.uprp.pl/wzory-przemyslowe/Lead05,35,1774,4,index,pl,text/
Patent Office of the Republic of Poland –https://www.uprp.pl/znaki-towarowe/Lead05,29,1703,4,index,pl,text/
Patent Office of the Republic of Poland – www.uprp.pl/oznaczenia-geograficzne/Lead05,36,1806,4,index,pl,text/
Patent Office of the Republic of Poland – www.uprp.pl/topografie-ukladow-scalonych/Lead05,37,1838,4,index,pl,text/
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