Receptacle and combined quick opening means

Claim 1

IN A RECEPTACLE, A WALL HAVING A CONTOUR DEFINING PERIMETER, THE WALL PORTION CIRCUMSCRIBED BY SAID PERIMETER BEING OF A RELATIVELY THIN TEARABLE MATERIAL, SAID MATERIAL BEING STRUCTURALLY MODIFIED ALONG A FULL CIRCULAR LINE LYING CLOSELY ADJACENT TO SAID PERIMETER IN A MANNER TO FACILITATE COMPLETE REMOVAL OF THE MAJOR PART OF THE WALL LYING WITHIN SAID PERIMETER, SAID STRUCTURAL MODIFICATION ALONG SAID LINE CONSISTING OF A WEEKENED REDUCED THICKNESS OF THE MATERIAL THROUGH THE MAJOR EXTENT OF SAID LINE AND A SLIT THROUGH THE MATERIAL ALONG A MINOR EXTENT OF THE LINE, AND PULL TAB MEANS CARRIED BY THE WALL MATERIAL WITHIN THE AREA CIRCUMSCRIBED BY SAID LINE OF EXERTING A MANUAL TEAR-OUT PULL UPON THE MATERIAL BETWEEN THE ENDS OF SAID SLIT WHEREBY THE ENTIRE WALL PORTION LYING WITHIN SAID CIRCULAR LINE IS REMOVABLE BY ONE QUICK PULL THEREON, ATTACHMENT OF THE PULL TAB BEING BETWEEN THE CENTER OF THE WALL AND THE SLIT ANDCENTRALLY BETWEEN THE ENDS OF THE SLIT WHEREBY UPON APPLICATION OF AN OUTWARD PULL TO THE TAB TEARING STRAIN WILL BE APPLIED SIMIULTANEOUSLY AND WITH EQUAL FORCE TO THE WEAKENED THICKNESS OF THE MATERIAL AT THE ENDS OF THE SLIT.