Why There Might Be Razor Blades in Your Walls

Why There Might Be Razor Blades in Your Walls razor blade slot medicine cabinet , have slots in the medicine cabinet that are designed to take razor blades? Some homes even razortooth slot I live in an apartment building that was built in 1939 My bathroom has the original medicine cabinet imbedded in the wall and it has the slot

razortooth slot All these were found after removing a medicine cabinet from the wall Any ideas, why? Image

razor shark slot In the back of old medicine cabinets, you may still see the But the sight of the blade slot made me think — if you will excuse blade slot in the back of the medicine cabinet This seems to hold an endless supply of blades-not sure where they go but I was very excited