Refrigerator panel

Claim 1

A PANEL COMPRISING A SINGLE SHEET OF STRUCTURAL MATERIAL HAVING A SUBSTANTIALLY FLAT OUTER SURFACE, SPACED HOLES IN SAID SHEET WHICH ARE DISPOSED SUBSTANTIALLY UNIFORMLY OVER THE SURFACE OF SAID SHEET, HOLLOW KNOBS WHICH ARE SHELL-LIKE IN CHARACTER HAVING THEIR OUTER SURFACES GENERALLY IN THE FORM OF SEGMENTS OF SPHERES, THE OUTER WALLS OF SAID KNOBS EXTENDING OUTWARDLY AND DOWNWARDLY AND ENDING IN CIRCULAR BOTTOM EDGES WHICH ENGATES SAID OUTER SURFACE, SAID KNOBS HAVING STEMS WHICH EXTENDS CENTRALLY OF THE KNOBS AND THROUGH SAID HOLES, SAID STEMS HVAING PORTIONS WHICH EXTEND BEYOND THE INNER SURFACE OF SAID SHEET, AND MEANS FOR EXPANDING SAID PORTIONS AGAINST THE EDGES OF SAID HOLES AT THE INNER SIDE OF SAID SHEET TO SECURE SAID KBOBS AND TO DRAW SAID CIRCULAR BOTOM EDGES INTO TIGHT ENGAGEMENT WITH SAID OUTER SURFACE.