Microfiche master

Claim 1

A MICROFICHE MASTER ADAPTED TO PRODUCE REFERENCE COPIES BY CONTACT PRINTING WITH A SENSITIVE FILM, SAID MASTER COMPRISING: (A) TOP AND BOTTOM RECTANGULAR PANELS FORMED OF TRANSPARENT, FLEXIBLE SYNTHETIC PLASTIC MATERIAL IN SUPERPOSED RELATION, (B) SPACING MEANS DISPOSED ALONG PARALLEL LINES BETWEEN SAID PANELS TO MAINTAIN SAID PANELS IN SPACED RELATION AND TO DEFING OPEN-ENDED MULTIPLE CHANNELS, ONE OF SAID PANELS HAVING CUT-OUTS THEREIN TO PROVIDE LATERAL OPENINGS FOR SAID CHANNELS TO FACILITATE THE END INSERTION OF FILM STRIPS THEREIN, AND (C) MICROFILM STRIPS INSERTED IN SAID CHANNELS, (D) SAID SPACING MEANS HAVING A THICKNESS NO GREATER THAN THAT OF SAID STRIPS TO AVOID SPACES BETWEEN CONTIGUOUS SURFACES OF SAID STRIPS AND SAID TOP PANEL, (E) SAID TOP PANEL HAVING A THICKNESS NO GREATER THAN ABOUT ONE MIL WHEREBY IN CONTACT PRINTING THE SURFACES OF SAID STRIPS ARE VIRTUALLY IN CONTACT WITH SAID SENSITIVE FILM TO PRODUCE READABLE REFERENCE COPIES, SAID BOTTOM PANEL HAVING A GREATER THICKNESS THAN SAID TOP PANEL TO IMPART BODY TO SAID MICROFICHE MASTER.