DIFF Subgroup
G11B 5/7253 Full Title
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor (G11B11/00 take precedence) > Record carriers characterised by the selection of the material > Protective coatings, e.g. anti-static > containing a lubricant
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.