Abstract: A perforated filing strip is provided and has a self-adhesive strip thereon for attachment to a document to be filed. The perforations in the filing strip receive locating pins or the like for filing. The perforations are on an outer part of the strip and the self-adhesive strip is on the inner part of the filing strip, the inner and outer parts being defined from each other by a fold line.

Abstract: A sheet of paper is folded by forming a portion of the sheet into S-shape with a folding loop of U-shape and a blind loop of opposite curvature, and pressing the opposite sides of the folding loop together in the direction from the open end towards the closed end of the loop, to produce a fold, while the shape of the blind loop is maintained without the sheet becoming folded in the region of this loop. Apparatus for performing the method is arranged to produce oppositely directed folds alternately along the length of the sheet. The opposite sides of the folding loop are pressed together by a folding roller which may cooperate with a table to both form the "S" loop and produce the fold, or a second roller which serves to clamp the sheet.