Ah, this is one of my 'dream machines'!  We had a neighbour in Pointe-Claire where I grew up who had a Youngstown electric sink with one of these 30-inch dishwashers and Youngstown disposer - both were out of service in 1971 when we moved to that area though.   There were rumours that the house we did move to once had the 30-inch Youngstown dishwasher; it was gone when we moved in and there was a honking big gap in our cupboards...  

I saw one at a church bazaar in 1989, just after I bought my first house,  but I passed on it because I couldn't load it into my Mazda 323....  Sigh... 

From what I have heard, these were poor dishwashers.  The neighbour who did have one said hers was awful and she was almost glad when it broke down (she bought a Maytag top-load portable dishwasher to replace it).