// todo need optimize like in event.jsp. Add indexing or not indexing this page. Hand Abacus (14 h 39 m, 21 nov 2018 año – 14 h 49 m, 1 jul 2019 año) (Cinta de tiempo)
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Hand Abacus (14 h 39 m, 21 nov 2018 año – 14 h 49 m, 1 jul 2019 año)

Descripción:

The Romans invented the hand abacus it contained several long and short grooves, and had up to five beads in each notch. The Romans developed their hand-abacus as a portable counting board-- the first portable calculating device for both engineers and businessmen.

Añadido al timeline:

Counting/Caculating Inventions

ByEmily Stark
4 nov 2019

fecha:

14 h 39 m, 21 nov 2018 año
14 h 49 m, 1 jul 2019 año
~ 7 months
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