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Claim 1

IN A FILING APPLIANCE THE COMBINATION OF A FOLDED MEMBER OF THIN BUT RELATIVELY RIGID SHEET MATERIAL, SAID FOLDED MEMBER PRESENTING AN ELONGATE ATTACHMENT PORTION FORMED BY MERE FOLDING OF SAID SHEET MATERIAL ALONG A NUMBER OF PARALLEL FOLDING LINES, AND A CHANNEL BAR MEMBER OF TRANSPARENT MATERIAL HAVING A LONGITUDINALLY EXTENDING GROOVE THEREIN FOR RECEIVING SAID ATTACHMENT PORTION OF THE FOLDED MEMBER, SAID GROOVE OF THE CHANNEL BAR MEMBER EXTENDING ALONG THE FULL LENGTH THEREOF AND HAVING A T-SHAPED CROSS-SECTION PRESENTING SHARP CORNERS BETWEEN THE LATERALLY EXTENDING SHANKS AND THE STEM OF THE T, AND T-SHAPED CROSS-SECTION HAVING A WIDTH BETWEEN THE OUTER ENDS OF THE SHANKS THAT IS SUBSTANTIALLY GREATER THAN THE THICKNESS OF THE STEM AND A THICKNESS OF THE SHANKS THAT IS RELATIVELY SMALL AS COMPARED WITH SAID STEM THICKNESS, SAID ATTACHMENT PORTION OF THE FOLDED MEMBER TAKING THE FORM OF AN OPEN-ENDED THINWALLED TROUGH HAVING A CROSS-SECTION SUBSTANTIALLY CONFORMING TO INSIDE CONTOUR OF SAID T-SHAPED GROOVE OF THE CHANNEL BAR MEMBER AND PRESENTING A SUBSTANTIALLY FLAT BOTTOM, THE EXTERNAL WIDTH OF WHICH SUBSTANTIALLY CORRESPONDS TO SAID WIDTH BETWEEN THE OUTER ENDS OF SAID SHANKS OF THE T-SHAPED CROSS-SECTION OF SAID GROOVE AND SUBSTANTIALLY EXCEEDS THE STEM THICKNESS THEREOF, AND EXTERNALLY CONCAVE SIDE WALLS SUBSTANTIALLY ACCOMMODATING THEMSELVES TO THE INNER SIDE WALL CONTOUR OF SAID T-SHAPED GROOVE AND BOTH EXTENDING OUT THROUGH THE LONGITUDINAL OPENING OF SAID GROOVE, SAID ATTACHMENT PORTION OF THE FOLDED MEMBER HAVING EXTERNAL MARKINGS THEREON VISIBLE THROUGH THE BOTTOM WALL PORTION OF SAID T-SHAPED GROOVE OF THE CHANNEL BAR MEMBER.