// todo need optimize like in event.jsp. Add indexing or not indexing this page. Improved slide rule (1 ene 1859 año – 14 h 49 m, 1 jul 2019 año) (Cinta de tiempo)
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Improved slide rule (1 ene 1859 año – 14 h 49 m, 1 jul 2019 año)

Descripción:

French artillery lieutenant Amédée Mannheim invented an improved slide rule.

Añadido al timeline:

Counting/Caculating Inventions

ByEmily Stark
4 nov 2019

fecha:

1 ene 1859 año
14 h 49 m, 1 jul 2019 año
~ 160 years
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