Negative holders

Claim 1

A NEGATIVE HOLDER COMPRISING A SUPPORT HAVING A SUBSTANTIALLY HORIZONTAL TOP FORMED WITH AN OPENING THEREIN THROUGH WHICH PRINTING LIGHT MAY PASS, MEANS CARRIED BY SAID TOP AND PROVIDING A SQUARE RECESS REGISTERING WITH THE OPENING IN SAID SUPPORT, A SQUARE MASK RECEIVED IN SAID RECESS AND HAVING AN OBLONG OPENING CORRESPONDING WITH THE PORTION OF THE NEGATIVE TO BE PRINTED, A FRAME HAVING SPACED LEGS AND A CONNECTING PORTION THEREBETWEEN OVERLYING SAID SUPPORT IN SPACED RELATION THERETO AND STRADDLING THE OPENING IN SAID MASK, A SINGLE UPRIGHT CARRIED BY THE SUPPORT AND DISPOSED OUTWARDLY OF THE OPENING IN THE MASK AND SOLELY WITHIN THE REENTRANT ANGLE FORMED BY THE PROJECTIONS OF TWO OF THE INTERSECTING EDGES OF THE OPENING, THEREBY PROVIDING A CLEAR PATH FROM FRONT TO BACK AND FROM SIDE TO SIDE OVER WHICH A STRIP OF FILM THE WIDTH OF SAID RECESS MAY BE MOVED EITHER LATERALLY OR LONGITUDINALLY, A SUBSTANTIALLY HORIZONTAL BEARING ON SAID UPRIGHT DISPOSED ABOVE THE FILM, A SHAFT JOURNALED IN SAID BEARING AND SECURED TO SAID FRAME AT A LOCALITY ABOVE THE FILM AND SUPPORTING SAID FRAME FOR SWINGING MOVEMENT TOWARD AND FROM SAID TOP, AND CLAMPING MEANS CARRIED BY THE LEGS OF SAID FRAME AND ENGAGEABLE WITH THE FILM TO HOLD THE SAME IN PRINTING POSITION.