HERE IS A VINTAGE , UNUSED, STILL SEALED ON CARD, NIGHT GUARD DOOR KNOB LOCK SYSTEM FOR HOME SECURITY. JUST SCREW THE ATTACHED SCREW INTO THE WALL OR DOORFRAME AND THE RING SLIPS OVER THE DOOR KNOB TO PROVIDE EXTRA SECURITY. IT SAYS MANY TIMES STRONGER THAN REGULAR CHAIN LOCKS. IT WAS MADE BY THE CARR CO. CORP, BELLEVUE WASHINGTON.

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