CPC Subgroup
G11B 5/325 Erasing heads using permanent magnets (general details therefor G11B5/133 - G11B5/255)
Full Title
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor (G11B11/00 take precedence) > Structure or manufacture of heads, e.g. inductive > Erasing heads using permanent magnets (general details therefor G11B5/133 - G11B5/255)