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Claim 1

A TOP END CLOSURE FOR A SELF-SUSTAINING TUBULAR CONTAINER HAVING A BODY PORTION DEFINED BY FOUR SIDE WALLS AND INCLUDING A BUILT-IN POURING SPOUT, SAID TOP END CLOSURE COMPRISING A PAIR OF PLANARLY DISPOSED OUTER CLOSURE PANELS EXTENDING FROM A PAIR OF OPPOSITELY DISPOSED SIDE WALLS, A PAIR OF PLANARLY DISPOSED INNER CLOSURE PANELS EXTENDING FROM THE REMAINING PAIR OF OPPOSITELY DISPOSED SIDE WALLS, SAID INNER CLOSURE PANELS BEING DISPOSED IN A PLANE SUBSTANTIALLY PARALLEL WITH AND CONTIGUOUS TO SAID OUTER CLOSURE PANELS, TWO PAIRS OF PLANARLY DISPOSED TRIANGULAR WING PANELS INTERPOSED BETWEEN AND IN FACE-TOFACE ENGAGEMENT WITH SAID OUTER CLOSURE PANELS AND SAID INNER CLOSURE PANELS, EACH PAIR OF SAID WING PANELS CONNECTING ONE OF SAID INNER CLOSURE PANELS TO SAID OUTER CLOSURE PANELS, TAB PORTIONS EXTENDING FROM EACH OF SAID PANELS INCLUDING FIRST TAB PORTIONS CONNECTED TO SAID INNER CLOSURE PANELS ALONG A STRAIGHT CONNECTION DISPOSED TRANSVERSE TO SAID FIRST MENTIONED PAIR OF OPPOSITELY DISPOSED SIDE WALLS, SAID WING PANELS IN A PAIR OF WING PANELS BEING SPACED APART A DISTANCE SUBSTANTIALLY EQUAL TO THE LENGTH OF SAID STRAIGHT CONNECTION, ONE WING PANEL OF EACH OF SAID PAIRS OF WING PANELS BEING PROVIDED WITH A LONG TAB PORTION AND THE OTHER THEREOF BEING PROVIDED WITH A SHORT TAB PORTION, ONE OF SAID OUTER CLOSURE PANELS BEING PROVIDED WITH A LONG TAB PORTION AND THE OTHER OF SAID OUTER CLOSURE PANELS BEING PROVIDED WITH A SHORT TAB PORTION, SAID LONG AND SHORT TAB PORTIONS OF SAID OUTER CLOSURE PANELS AND SAID WING PANELS BEING SECURED TOGETHER TO FORM A FLAT MULTI-LAYER SEAM WITH THE LONG TAB PORTION ON SAID ONE OUTER CLOSURE PANEL AND THE LONG TAB PORTIONS ON SAID WING PANELS IN OVERLAPPING RELATION AND SAID SHORT TAB PORTIONS ON SAID OTHER OUTER CLOSURE PANEL AND SAID SHORT TAB PORTIONS AND INTERPOSED BETWEEN THE LONG TAB PORTIONS TO PROTION AND INTERPOSED BETWEEN THE LONG TAB PORTIONS TO PRODUCE AN INTERLOCKED BUTT AND LAP SEAM, SAID FIRST TAB PORTIONS BEING FOLDED BACK UPON SAID INNER CLOSURE PANELS BENEATH SAID BUTT AND LAP SEAM AND BEING SECURED TO SAID BUTT AND LAP SEAM TO FORM A PART THEREOF AND PRODUCE A SEALED FLAT UNOBSTRUCTED TOP FOR SAID CONTAINER, ONE OF SAID INNER CLOSURE PANELS, THE ADJACENT WING PANELS AND ADJACENT PORTIONS OF THE OUTER CLOSURE PANELS COMPRISING A POTENTIAL POURING SPOUT FOR SAID CONTAINER, AND TEAR MEANS IN SAID ONE INNER CLOSURE PANEL AND SAID ADJACENTLY DISPOSED WING PANELS AND OUTER CLOSURE PANEL PORTIONS FOR TEARING SAID SEAM ENDWISE TRANSVERSELY OF SAID ONE INNER CLOSURE PANEL TO RELEASE SAID ONE INNER CLOSURE PANEL AND ITS ADJACENTLY DISPOSED WING PANELS AND OUTER CLOSURE PANEL PORTIONS FOR FORMATION INTO SAID POURING SPOUT.