Sughrue, Mion, Zinn, Macpeak and Seas
Magnetic recording medium
 A magnetic recording medium is disclosed which comprises a non-magnetic support having provided on opposite surface thereof a magnetic recording layer, and a backing layer containing carbon black and a binder, said carbon having an average particle size of not less than 150 m.mu. and the weight ratio of carbon black and the binder being 1:3.0 to 1:10. 
Fuji Photo Film Co., Ltd.
Y G Y Y Y
Y10T G11B Y10T Y10S Y10T
additional inventional additional additional additional
Takahito Ryuji Tadashi Masaaki
Miyoshi Shirahata Ishikuro Fujiyama