B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
B42B—PERMANENTLY ATTACHING TOGETHER SHEETS, QUIRES OR SIGNATURES OR PERMANENTLY ATTACHING OBJECTS THERETO
B42B5/00—Permanently attaching together sheets, quires or signatures otherwise than by stitching
B42B5/08—Permanently attaching together sheets, quires or signatures otherwise than by stitching by finger, claw or ring-like elements passing through the sheets, quires or signatures
B42B5/12—Permanently attaching together sheets, quires or signatures otherwise than by stitching by finger, claw or ring-like elements passing through the sheets, quires or signatures the elements being coils