John W Wenner: Magnetic read/write head with partial gap and method of making. International Business Machines Corporation Armonk NY, Hanifin and Jancin, F A Sirr, November 16, 1971: US3621153 (8 worldwide citation)

A magnetic head having a plurality of read/write tracks, each track being formed of a single continuous lamina of high-permeability magnetic material which is wrapped around the edge of a support substrate and extends through an opening in the substrate. A coil encircles one leg of each of the lamin ...