Gebrauchsanweisung für die Rechenmaschinen Triumphator bauart Modelle H und K
Form. No. 446.
148mm × 210mm
This is the basic manual for the Triumphator mechanical calculator, models H and K, in German. It briely explains the four arithmetic operations, and has some oiling instructions. The booklet has no copyright date so could have been printed any time that these models were in production, between 1920 and 1938.