I found a strange and old electrical device. It seems it could be plugged into the wall and you could plug another equipment in it. Inside there is a sort of heating resistor, I'm not sure. I don't know what is it or where it comes from. Has someone already see that? Thanks for any suggestions
EDIT I live in France so we have 220v 50Hz but before we had 110v 50Hz, so maybe it could be a adaptative device?