Fabricated corner construction

Claim 1

IN AN AQUARIUM, A FRAME OF RELATIVELY THIN MATERIAL HAVING AT LEAST ONE CORNER OF ONE-PIECE CONSTRUCTION, SAID FRAME IN THE AREA OF SAID CORNER, COMPRISING A SIDE PORTION EXTENDING ALONG TWO SIDES OF THE AQUARIUM AND SMOOTHLY AROUND SAID CORNER IN AN ARC OF SUBSTANTIALLY UNIFORM RADIUS, A FIRST TOP PORTION INTEGRAL WITH AND EXTENDING PERPENDICULARLY FROM THAT PORTION OF SAID SIDE PORTION ALONG ONE OF SAID AQUARIUM SIDES, SAID FIRST TOP PORTION TERMINATING ALONG A FIRST LINE RADIAL TO AND SUBSTANTIALLY BISECTING SAID ARC OF SUBSTANTIALLY UNIFORM RADIUS AND ALONG A SECOND LONE ADJACENT SUBSTANTIALLY ONEHALF OF SAID ARC OF SUBSTANTIALLY UNIFORM RADIUS, A SECOND TOP PORTION INTEGRAL WITH AND EXTENDING PERPENDICULARLY FROM THAT PORTION OF SAID SIDE PORTION ALONG THE OTHER OF SAID AQUARIUM SIDES, SAID SECOND TOP PORTION TERMINATING ALONG A THIRD LINE IN ABUTMENT WITH SAID FIRST LINE AND ALONG A FOURTH LINE ADJACENT SUBSTANTIALLY TO OTHER HALF OF SAID ARC OF SUBSTANTIALLY UNIFORM RADIUS, AND A TAB SECURED TO SAID FIRST AND SECOND TOP PORTIONS FOR MAINTAINING SAID PORTIONS IN ABUTMENT ALONG SAID FIRST AND THIRD RADIAL LINES.