Italy 1990 Giovanni Giorgi inventor Giorgi/MKSA System of Electrotechnical Units 1v MNH
Italy 1990 Giovanni Giorgi inventor Giorgi/MKSA System of Electrotechnical Units 1v MNH 146679
Italy 1990 Giovanni Giorgi inventor Giorgi/MKSA System of Electrotechnical Units 1v MNH 146679