I just bought a house from 1930, and it has a capped off 240 volt plate on the floor of the bedroom. What the heck do you think was this used for?

240 volt box, with a blank plate on it. Asked the former owner why there was a 240 connection on the floor of the master bedroom and she said she had no idea why. Looks old, mid 50's or earlier would be my guess.

Anyone have any clue what this could have been used for? I don't think it was from a water heater or from an electric space heater. I can't think of any other 240v device you'd put in your bedroom, and even if you did, I can't think of any reason you'd put the connection in the floor versus the wall.

Edit: I'm in Florida.