@hudson155,
Oh my. Such an easy question, and I'm hopelessly out of date. When I was assigned to Germany in the late '60s, the answer was to go to the PX and buy a converter box. I didn't know how they worked, and didnt' need to. They worked. I'm pretty sure the technology hasn't been lost.
Tried googling 'electrical converter boxes'? Or try the same at Amazon.