// todo need optimize like in event.jsp. Add indexing or not indexing this page. Cylindrical slide rule (1 ene 1891 año – 14 h 49 m, 1 jul 2019 año) (Cinta de tiempo)
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Cylindrical slide rule (1 ene 1891 año – 14 h 49 m, 1 jul 2019 año)

Descripción:

Edwin Thacher introduced a cylindrical slide rule in the United States.

Añadido al timeline:

Counting/Caculating Inventions

ByEmily Stark
4 nov 2019

fecha:

1 ene 1891 año
14 h 49 m, 1 jul 2019 año
~ 128 years
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