What is the purpose of power outlets with T-shaped holes?

website t slot receptacle 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? tips bermain slot T-Slot TandemParallel Combo Duplex Convenience Electric Outlet Receptacle 15A-125V or 10A-250V Model 1913 Ivorine ivory color Bakelite

t slot receptacle receptacle circuit breaker protected 50 amp inlet and outlet - recessed for safety L6-30 receptacle 6 NEMA L5-20R 20 amp T-Slot receptacles each with a   T slot receptacles are 20 amp Straight blade are 15 amp Your question should be: where are 20 amp circuits required? My electrical  receptacle circuit breaker protected 50 amp inlet and outlet- recessed for safety L6-30 receptacle 6 NEMA L5-20R 20 amp Twist lock receptacles with a GF

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