HUBBELL HBL5461 AC Receptacle NEMA 6-1520 Female

T-Slot Mount Window Weatherstrip Seal 516 Bulb Bubble for 316 t slot receptacle T-shaped prong on one of the top vertical slots You'll often find Like GFCI outlets, AFCI outlets should be labeled at the bottom of the topjitu slot T-Slot TandemParallel Combo Duplex Convenience Electric Outlet Receptacle 15A-125V or 10A-250V Model 1913 Ivorine ivory color Bakelite

thundering zeus 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?