I believe Germany has made the Iron Cross her own.  I don't know of any place that associates Poland with the Iron Cross.  That Eagle is from the Franceof the 1800s , it dates back to when Napolean Bonneparte declared himself Emporer.  The Fasces are of course the emblem of the Roman Senate, that was later used by Mussolini's Fascists, which is a pretty unussual emblem, since anybody who knows anything about the History of Rome knows amongst the factions the Senate preferred a Republic and the Emperor of course an Empire.  The US Republic has Roman Fasces in the decorations of the Senate building.