Photographic film assemblage

Claim 1

IN A PHOTOGRAPHIC FILM UNIT ADAPTED TO BE DRAWN BETWEEN A PAIR OF JUXTAPOSED MEMBERS, IN COMBINATION: A FIRST LEADER FOR DRAWING SAID FILM UNIT BETWEEN SAID JUXTAPOSED MEMBERS AND HAVING A LEADING END SECTION ADAPTED TO BE MOVED BETWEEN SAID MEMBERS; AND AN ELONGATED SECOND LEADER COUPLED AT ONE END WITH SAID FIRST LEADER AND ADAPTED TO BE DRAWN TO ONE SIDE OF SAID JUXTAPOSED MEMBERS FOR MOVING SAID FIRST LEADER BETWEEN SAID JUXTAPOSED MEMBERS, SAID SECOND LEADER HAVING A TENSILE STRENGTH WHICH IS SUBSTANTIALLY UNIFORM THROUGHOUT THE LENGTH OF SAID SECOND LEADER; SAID SECOND LEADER BEING COUPLED WITH SAID FIRST LEADER AT A POSITION THEREON SPACED FROM THE LEADING EDGE OF SAID FIRST LEADER TOWARD THE OPPOSITE END THEREOF, SAID SECOND LEADER INCLUDING DISCRETE AREAS AT SAID ONE END AT WHICH SAID SECOND LEADER IS COUPLED WITH SAID FIRST LEADER BY ADHESIVE BONDS HAVING AN AGGREGATE SHEAR STRENGTH AT LEAST APPROXIMATELY EQUAL TO SAID TENSILE STRENGTH OF SAID SECOND LEADER AND TENSILE STRENGTHS LESS THAN SAID SHEAR STRENGTH OF SAID SECOND LEADER IMPARTING TO SAID SECOND LEADER A TENDENCY TO SEPARATE FROM SAID FIRST LEADER IN THE REGION OF SAID AREAS IN RESPONSE TO THE APPLICATION OF TENSION TO SAID SECOND LEADER IN A DIRECTION DIVERGENT FROM THE DIRECTION OF MOVEMENT OF SAID FIRST LEADER BETWEEN SAID JUXTAPOSED MEMBERS.