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Gebrauchs-Anweisung für die "Thales" Rechenmaschine

Gebrauchs-Anweisung für die "Thales" Rechenmaschine Thaleswerk GmbH 1911-1920 24 page booklet 131mm × 196mm This is the German manual for the Thales model A calculator. The drawing shows the earliest version of the machine which has wingnuts for clearing the registers. In 1920 these were replaced by small cranks, so this booklet was printed between 1911 and 1920.

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