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Claim 1

THE COMBINATION OF A PAIR OF RIGID TUBULAR TILES AND AN INTERCONNECTING SPACER, COMPRISING, SPACING MEANS DISPOSED BETWEEN ADJACENT CONFRONTING ENDS OF SAID TILES FOR SPACING THEREOF IN AXIAL ALIGNMENT WITH EACH OTHER, PIVOTALLY DEFORMABLE, ARCUATE CONNECTING MEANS SECURED TO SAID SPACING MEANS ON OPPOSITE RADIAL SIDES OF SAID CONFRONTING ENDS OF THE TILES AND EXTENDING CIRCUMFERENTIALLY THEREABOUT BY A LIMITED AMOUNT TO RESTRICT PIVOTAL SEPARATION OF THE TILES TO ONE PLANE AND PREVENT AXIAL SEPARATION THEREBETWEEN, SAID ARCUATE, PIVOTALLY DEFORMABLE CONNECTING MEANS COMPRISES A RADIALLY OUTER SHIELD AND A RADIALLY INNER PANEL, SAID SHIELD AND PANEL EXTENDING AXIALLY BETWEEN SAID TILES AND CIRCUMFERENTIALLY THEREABOUT BY LESS THAN 180* IN ORDER TO ACCOMMODATE PIVOTAL SEPARATION IN SAID ONE PLANE.