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Obviously a variant of the Produx. The Tip is the only physical variant that I have seen with the 'Subtraction' and 'Addition' spelled out instead of using the '-' and '+' symbols. The ad at Produx, however, does show a Produx with the words spelled out.
Yes, product of Otto Meuter (Product name = Produx) F. Diestelkamp 17:08, 16. Nov 2011 (CET)

Ricavato da "http://www.rechnerlexikon.de/it/wiki.phtml?title=Diskussion:TIP"
Ultima modifica il 08:14, 17. Nov 2011.