Many Wall Plugs Fit in One Outlet (May, 1934)
This is actually a really good idea, though I think their claim of unlimited plugs in one outlet is a little optimistic. It would be really nice if powerbricks had outlets in them.
Many Wall Plugs Fit in One Outlet
DOUBLE and triple outlet electric plugs are no longer needed. A novel wall plug now available is of such a design that another plug can be inserted right on top of it. There is no limit to the number of extension cords that can be used on one outlet.