Why Do Some Old Houses Have Slits in the Medicine Cabinet?

Man finds mysterious slot in back of bathroom medicine cabinet razor blade slot in medicine cabinet No, I use a blade bank I was thinking that you could cut a small slot in the wall and then cover the slot with a nice shiny plate that has a razor shark slot online slot can also be cut into a medicine cabinet or wall and the blades disposed of that way

razor shark slot machine Homeowners are advised to check bathrooms for the presence of such slots in the medicine cabinets of older homes before undertaking remodeling