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Fractomator

".. 'Fractomator', an addiator that also adds inches and 1/16th's. It has a heavy desk stand, which measures 14.5 x 20 x 1.7 cm (when closed), and allows it to be operated with one hand (according to the instructions). The back of the addiator is used for subtractions.

The addiator itself is marked 'made in Germany', the instructions are marked 'Addiator Rechenmaschinenfabrik C. Kubler, West Berlin, Germany'."

Andries de Man

Source: Andries de Man

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