using recording by electric charge or by variation of electric resistance or capacitance

Full Title

Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups or by different subgroups of group; Record carriers therefor > using recording by electric charge or by variation of electric resistance or capacitance

Classification Context

Section:

PHYSICS

Class:

INFORMATION STORAGE

Subclass:

INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER