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Hand Abacus (14 St. 39 Min, 21 Nov 2018 Jahr – 14 St. 49 Min, 1 Jul 2019 Jahr)

Beschreibung:

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.

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Datum:

14 St. 39 Min, 21 Nov 2018 Jahr
14 St. 49 Min, 1 Jul 2019 Jahr
~ 7 months