Combined read-write and erase head assembly

Claim 1

A MAGNETIC HEAD ASSEMBLY FOR TRANSFERRING DATA BETWEEN A MULTI-TRACK MAGNETIC STORAGE MEDIUM AND SAID ASSEMBLY IN A RANGE OF FREQUENCIES DEFINED BY THE WAVE LENGTHS $F MIN. TO $F MAX., WHERE $F MIN. $5$F MAX., SAID HEAD ASSEMBLY COMPRISING A CURVED SURFACE ADAPTED TO BE PRESENTED TO SAID STORAGE MEDIUM, A PLURALITY OF SUBSTANTIALLY IDENTICAL FLAT MAGNETIC READ-WRITE CORES POSITIONED PARALLEL TO EACH OTHER ALONG THE TRANSVERSE DIMENSION OF SAID HEAD ASSEMBLY AT INTERVALS CORRESPONDING TO THE SPACING OF SAID TRACKS, EACH OF SAID READ-WRITE CORES BEING ASYMMETRICALLY DIVIDED BY A PLANE TO FORM A PAIR OF CORE SECTIONS OF PROGRESSIVELY DECREASING CROSS-SECTIONAL AREA, EACH OF SAID CORE SECTIONS INCLUDING A BASE PORTION SUBSTANTIALLY NORMAL TO SAID PLANE RESPECTIVE BASE PORTIONS ABUTTING EACH OTHER IN SAID PLANE TO FORM A CONTINUOUS FLUX PATH, EACH OF SAID CORE SECTIONS FURTHER INCLUDING A CORE LEG HAVING A FIRST AND SECOND PORTIONS, SAID FIRST LEG PORTION BEING SUBSTANTIALLY NORMAL TO ITS BASE PORTION, SAID SECOND LEG PORTION BEING ANGULARLY DISPOSED WITH RESPECT TO SAID FIRST LEG PORTION AND CONVERGING TOWARD SAID PLANE, THE EXTERIOR SURFACE OF SAID SECOND LEG PORTION BEING TERMINATED BY SAID PRESENTING SURFACE AND INTERSECTING THE LATTER AT A PREDETERMINED ANGLE, SAID ANGLE BEING ADAPTED TO DECREASE THE FLUX LINKAGE BETWEEN SAID CORE AND SAID STORAGE MEDIUM AT A RATE OF AT LEAST 6 DB PER OCTAVE FOR FREQUENCIES BELOW SAID F MIN., A POLE PIECE EXTENDING FORM SAID SECOND LEG PORTION TOWARD SAID PLANE AND HAVING INTERIOR AND EXTERIOR SURFACES SUBSTANTIALLY PARALLEL TO SAID BASE, THE LENGTH OF SAID EXTERIOR SURFACE BEING SUBSTANTIALLY EQUAL TO