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SCM Marchant Cogito 240SR Electronic Calculator (1966).

Victor Series 1800 Scientific Calculator (1973). I recently purchased a hand-held scientific calculator at Dollar Tree for one dollar!

Gramola de maleta de "La Voz de su Amo", modelo 102, fabricado entre 1929 y 1931.

Nunca olvidarán su primera máquina de escribir!

Burroughs Mod. 2. The first printing calculating machine was invented in the USA (about 1905) and was selled worldwide. It features a complete keyboard for 17 digits, a printing unit and a long carriage for the sheet paper. The device could be used as a simple electronic accounting machine.

The evolution of technology.