Mr. Stern looking for business in the U.S.A. - 1973

The first domestic microwave oven was commercialized in 1967 in the USA.

Where did Mr. Stern hear of microwave ovens in 1973 in Austria?

???

Fact is that he was looking for business contacts to import them to Vienna.

(How could this be of interest?  ... Now i know that Desider Josef Stern was in the Schulerstrasse in 1973. Research is a journey. A beautiful one.)

Also did he try to import outboard motors: