Pressure injection mold

Claim 1

A PRESSURE INJECTION MOLD ADAPTED TO FORM A THIN UNITARY BODY AROUND A SINGLE MAGNETIC RECORDING AND REPRODUCING HEAD COMPRISING (A) A TOP SECTION AND A BOTTOM SECTION COOPERATIVELY ENGAGEABLE WITH EACH OTHER, SAID BOTTOM SECTION HAVING AN OBLONG, DEEP DEPRESSION CONFORMING TO THE DESIRED SHAPE OF SAID BODY AND A SHALLOW DEPRESSION EXTEDNDING LATERALLY FROM EACH SIDE OF SAID DEPRESSION AND ADAPTED TO SUPPORT THE ENDS OF A CONFRONTING PAIR OF GENERALLY C-SHAPED POLE PIECES, SAID TOP SECTION HAVING A DEEP DEPRESSION OF THE SAME SHAPE AS SAID DEEP DEPRESSION IN SAID BOTTOM SECTION AND AN APERTURE PASSING THERETHROUGH AND ADAPTED TO PERMIT THE INTRODUCTION OF A FLUID UNDER HIGH PRESSURE INTO SAID DEEP DEPRESSION OF SAID TOP SECTION, AND (B) A PAIR OF ADJUSTABLE PRESSURE BARS SLIDABLY MOUNTED IN SAID BOTTOM SECTION AND MAINTAINED SEPARATE FROM SAID DEEP DEPRESSION, EACH OF SAID PRESSURE BARS BEING ADAPTED TO SLIDE INTO ONE OF SAID SHALLOW DEPRESSIONS IN A DIRECTION PARALLEL TO THE LONGITUDINAL AXIS OF SAID DEEP DEPRESSION AND TO SUPPLY EQUAL PRESSURE TO THE POLE PIECES IN SAID SHALLOW DEPRESSION.