I concur with Lyndon on that point; I've seen a few of those hatchet-hammer-plier tools that were pre-WWII (the earliest U.S. patents I've seen for them are 86,048 from 1869 and 626,285 from 1899) but there seem to be a lot more of them around that were made post-war.
A couple of mine still have the original box and paperwork. They were advertised as all-purpose "household" tools.