Nestable interlocking seal blank

Claim 1

IN A SEAL BLANK USEFUL IN FORMING A CONNECTION BETWEEN OVERLAPPING PORTIONS OF METALLIC STRAPPING, WIRE AND THE LIKE AND ADAPTED TO BE NESTED AND INTERLOCKED WITH ANOTHER AND SIMILARLY FORMED SEAL BLANK, HAVING A BACK PLATE TO WHICH IS JOINED A PAIR OF DIAGONALLY OUTWARDLY EXTENDING RECTANGULAR FLANGES ALONG THE SIDE EDGES THEREOF, EACH FLANGE HAVING GENERALLY PLAIN INNER AND OUTER FACES, THE IMPROVEMENT WHICH COMPRISES A SMALL ELONGATE PROJECTION UPSTANDING FROM THE INNER FACE OF EACH FLANGE WITH THE LONG DIMENSION OF SAID PROJECTION PARALLEL TO THE OUTER EDGE OF THE FLANGE, SAID PROJECTION HAVING GRADUALLY SLOPING ENDS AND INWARDLY TAPERING SIDES, AND AN ELONGATE RECTANGULAR SLOT IN THE OUTER SURFACE OF EACH FLANGE POSITIONED DIRECTLY CLOSER TO THE BACK PLATE THAN SAID PROJECTION AND WITH ITS LONG DIMENSION PARALLEL TO THE OUTER EDGE OF THE FLANGE, SAID SLOT HAVING GRADUALLY INWARDLY AND DOWNWARDLY SLOPING END WALLS, AND SAID SLOT HAVING A SHARPLY INWARDLY AND DOWNWARDLY SLOPING SIDE WALL REMOTE FROM THE OUTER EDGE OF THE FLANGE AND ADAPTED TO BE ENGAGED BY THE TAPERING SIDE OF A PROJECTION OF A SIMILARLY FORMED SEAL BLANK TO SECURE THE BLANKS TOGETHER IN NESTED RELATIONSHIP WITH SLIGHT MOVEMENT OF THE NESTED BLANKS IN FOUR DIRECTIONS, SAID BLANKS BEING DISENGAGED BY SLIDING ONE BLANK RELATIVE TO THE OTHER SO THAT ONE SLOPING END OF THE PROJECTION WILL SLIDE ON A SLOPING END WALL OF THE SLOT IN WHICH THE PROJECTION IS ENGAGED.