u/Maximum_Still_2617

I've been looking into the history of box fans, but can't seem to find information on who made the first one. I've found a lot on the first electric fans in general (circular shaped) and an ad for a window fan from 1955 (and another ad here if anyone is interested!), but I'm not sure if this is when the first box/square design was introduced or just an early example.

Does anyone know?