ASTRA

1922

"In Germany, an interesting case is the Astra produced by Astrawerke in 1922. It was based on the Dalton machine but had [00, 000] multi-zero keys."  James Redin - A Brief History of Mechanical Calculators - Part II
Photo Source: Tullio Parravicini - Calcolatrici & Strumenti di Calcolo Meccanico.

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