Sheet file, whose sheets are vertically suspended

Claim 1

A VERTICAL FILE FOR CLASSIFICATION BY VERTICAL SUSPENSION OF TWO DIFFERENT TYPES OF SHEETS, AN UPPER SHEET AND A LOWER SHEET, COMPRISING A KNOWN MOVABLE FRONT OPENABLE SECTION AND A STATIONARY BACK SECTION, THE UPPER PARTS OF SAID SECTIONS BEING PROVIDED WITH TO MUTUALLY PARALLEL SERIES OF TELESCOPIC SUPPORTING ARMS, AND UPPER SERIES AND A LOWER SERIES, EACH OF SAID SUPPORTING ARMS HAVING A MALE AND A FEMALE MEMBER RESPECTIVELY ATTACHED BY ONE OF ITS ENDS TO ONE OF SAID UPPER PARTS, EACH OF SAID LOWER SHEETS HAVING ATTACHED ON ITS UPPER PORTION A FIRST SUPPORTING STRIP PROVIDED WITH A ROW OF HOLES, CORRESPONDING TO SAID LOWER SERIES OF SUPPORTING ARMS FOR ENGAGEMENT THEREOVER, EACH OF SAID UPPER SHEETS HAVING ATTACHED ON ITS UPPER PORTION ANOTHER SUPPORTING STRIP PROVIDED WITH AN UPPER ROW OF HOLES CORRESPONDING TO SAID UPPER SERIES OF SUPPORTING ARMS FOR ENGAGEMENT OVER THEM, THE UPPER PORTION OF SAID SUPPER SHEET WHICH IS ADJACENT TO SAID OTHER SUPPORTING STRIP HAVING A LOWER ROW OF HOLES CORRESPONDING TO SAID LOWER SERIES OF SUPPORTING ARMS WHICH THUS PASS FREELY THROUGH THEM, DUE TO THE NONOVERLAPPING OF SAID SUPPORTING STRIPS, A CLEARANCE HAVING THE FORM OF A STRAIGHT LINE IS PROVIDED WHICH EXTENDS BETWEEN THE UPPER EDGE OF SAID LOWER SUPPORTING STRIP AND THE LOWER EDGE OF SAID UPPER SUPPORTING STRIP.