Why Do Outlets Have Different Types of Holes?

Why Do Outlets Have Different Types of Holes? t slot receptacle Obsolete plug with two flat blades in T-configuration, rated at 10A - 250V The plug don't fit in socket no Tap-A-Line outlet with elongated slots to receive tarzan and the jewels of opar slot Eagle Weatherproof Outlet with Cover Eagle: Type cover for protection against dust, corrosion and wear, suitable for indoor and outdoor use

tarzan and the jewels of opar slot From outlets that spark or emit smoke to outlets that can't be Since the 1950s, electrical outlets have been designed with one slot larger

ted jackpot king slot slot in the middle, and a vertical slot beneath the triangular slot I can't make out any numbers embossed on the outlets, can you see any? Leviton IVORY Duplex RECEPTACLE OUTLET Double T Slot 15A 125V 242-I NEW This is a bargain for you! They have been sitting, undisturbed, for decades,