Marshall, O'Toole, Gerstein, Murray & Bicknell
Magnetic recording medium
 A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer thereon containing a ferromagnetic CrO.sub.2 powder dispersed in a resin binder. The magnetic layer contains 0.01-1.0 wt % of Al.sub.2 O.sub.3 powder on the basis of the CrO.sub.2 powder so as to improve wear of magnetic heads. 
TDK Corporation
G Y Y G
G11B Y10S Y10T G11B
inventional additional additional inventional
Ikuko Hiroyuki Norifumi
Yanagiuchi Yamada Kajimoto