// todo need optimize like in event.jsp. Add indexing or not indexing this page. Steady development of mechanical calculators -size reduction, electronic motor drive, and other added features 1900-1975 (12 ene 1900 año – 29 ene 1975 año) (Cinta de tiempo)
Steady development of mechanical calculators -size reduction, electronic motor drive, and other added features 1900-1975 (12 ene 1900 año – 29 ene 1975 año)
