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When Elwro created its first calculator using an imported specialized integrated circuit - model 105, Eltra built a similar design called K-741, based on a mysterious cube, probably MOSTEK. How did they differ and in which directions did the manufacturers go? I invite you to support my channel: https://patronite.pl/smialekadam PayPal.Me/smialekadam https://www.paypal.com/paypalme/smial... and to subscribe: https://www.youtube.com/AdamSmialek/?... #Eltra #K741 #kalkulator