Safety closure

Claim 1

A CONTAINER AND SAFETY CLOSURE THEREFOR, INCLUDING IN COMBINATION: (A) A CONTAINER HAVING A CYLINDRICAL NECK AT THE TOP END THEREOF AND INTEGRAL THREADS MOLDED IN THE CYLINDRICAL NECK; (B) AN INTERIOR CAP ELEMENT INCLUDING A PLANAR TOP AND A CYLINDRICAL COLLAR HAVING INTERNAL THREADS MATING WITH THE THREADS ON THE NECK OF THE SAID CONTAINER, THE TOP OF SAID INTERIOR CAP ELEMENT HAVING A FIRST RECESS THEREIN, THE SAID FIRST RECESS BEING CIRCULAR AND FALLING IN THE CENTER OF THE TOP OF THE SAID INTERIOR CAP ELEMENT, SAID INTERIOR CAP ELEMENT HAVING A SECOND RECESS THEREIN, SAID SECOND RECESS BEING LOCATED IN THE TOP OF THE INNER CAP ELEMENT BETWEEN SAID FIRST RECESS AND THE SAID CYLINDRICAL COLLAR OF SAID INTERIOR CAP ELEMENT; (C) AN EXTERIOR CAP ELEMENT HAVING A PLANAR TOP AND A COLLAR FITTING LOOSELY CONCENTRICALLY ABOUT THE COLLAR OF THE INTERIOR CAP ELEMENT FOR ROTATION RELATIVE THERETO, SAID EXTERIOR CAP ELEMENT HAVING A PASSAGE THERETHROUGH OF A SUFFICIENT SIZE TO PERMIT ACCESS TO THE SAID FIRST AND SAID SECOND RECESSES SIMULTANEOUSLY; (D) AND A REMOVABLE PLUG SIZED TO FIT INTO SAID PASSAGE IN SAID EXTERIOR CAP ELEMENT, SAID PLUG HAVING A PIN EXTENDING DOWNWARDLY THEREFROM FOR REGISTRY EITHER WITH SAID SECOND RECESS OR WITH SAID FIRST RECESS, SAID PIN BEING SIZED RELATIVE TO SAID FIRST RECESS THAT WHEN IN SAID FIRST RECESS, SAID PIN MAY MOVE FREELY IN A CIRCULAR DIRECTION WHEREBY SAID EXTERIOR AND INTERIOR CAP ELEMENTS CAN BE ROTATED FREELY RELATIVE TO ONE ANOTHER, SAID PIN BEING SIZED RELATIVE TO SAID SECOND RECESS THAT WHEN IN SAID SECOND RECESS SAID PIN IS RESTRAINED FROM CIRCULAR MOVEMENT WHEREBY THE SAID EXTERIOR AND INTERIOR CAP MEMBERS ARE RESTRAINED FROM RELATIVE ROTARY MOVEMENT.