Tamper-proof safes

Claim 1

IN A CABINET HAVING AN OUTER WALL AND INCLUDING: A CLOSURE, MEANS FOR FASTENING SAID CLOSURE TO SAID CABINET, AND MEANS FOR CONTROLLING THE OPERATION OF SAID FASTENING MEANS, THE IMPROVEMENT COMPRISING: AN AUXILIARY CLOSURE FASTENING MEANS, MEANS FOR NORMALLY URGING SAID AUXILIARY FASTENING MEANS INTO CLOSURE FASTENING POSITION, AND MEANS FOR RESTRAINING SAID URGING MEANS COMPRISING: A SHATTERABLE FLAT PLATE MEANS INSIDE SAID OUTER WALL AND LOCATED TO SHIELD AT LEAST PART OF SAID CONTROLLING MEANS, SAID PLATE MEANS HAVING THE PROPERTY OF CRACKING INTO SMALL FRAGMENTS SUBSTANTIALLY UNIFORMLY THROUGHOUT ITS ENTIRE EXTENT WHEN ANY PART THEREOF IS ABNORMALLY DISTURBED, MEANS TO CONNECT SAID AUXILIARY FASTENING MEANS TO SAID PLATE MEANS, COMPRISING A PORTION OF SAID PLATE MEANS HAVING AN APERTURE THEREIN AND BEING LOCATED IN A SPACE SUFFICIENT TO PERMIT BENDING AND PULLING APART OF SAID PLATE WHEN SHATTERED, A STUD MEANS IN SAID APERTURE HAVING MEANS AT ONE END THEREOF TO ENGAGE ONE SURFACE OF SAID PLATE MEANS AND HAVING MEANS AT THE OTHER END OF SAID STUD MEANS EXTENDING AWAY FROM THE OPPOSITE SURFACE OF SAID PLATE MEANS, AND A LINK MEANS CONNECTING SAID OTHER END OF SAID STUD MEANS TO SAID AUXILIARY FASTENING MEANS TO RESTRAIN SAID URGING MEANS, WHEREBY ANY DRILLING, PUNCHING OR HEATING OF ANY PART OF SAID PLATE CAUSING IT TO SHATTER CAUSES SAID URGING MEANS TO BEND AND PULL ON SAID PORTION OF SAID PLATE MEANS THROUGH SAID STUD MEANS AND SAID LINK MEANS TO REMOVE THE EFFECT OF SAID RESTRAINING MEANS AND TO PERMIT SAID URGING MEANS TO MOVE SAID AUXILIARY FASTENING MEANS INTO ITS CLOSURE FASTENING POSITION.