A century of sounds of 20 different calculators from 1897 to nowadays, from mechanical to electronic

The sound of 20 different calculators, from 1897 to 2010. A journey through a century of calculators, from the first mechanical calculators to the latest electronic calculators. Many types of calculators, mechanical, electromechanical, electronic, with their different sounds. Listen to the sound of: Arithmometer Payen, Addix, Torpedo, Madas 20A, Olivetti MC3, MC4M, Aldo Bona Alfa, Brunsviga 20, Monroe, Thales, Everest Z5, Plurima, Saba, Felt & Tarrant Comptometer, Nisa, Antares, Olivetti Logos 58, 694, 912, Triumph Adler 1218PD. For some of them there is already the video in my channel, for the others I hope it will be there soon.