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DIFF Subgroup
H04R 21/04

Gramophone pick-ups using a stylus; Recorders using a stylus

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Variable-resistance transducers > Gramophone pick-ups using a stylus; Recorders using a stylus

CPC:

Variable-resistance transducers (gaseous resistance transducers H04R23/00; magneto-resistive transducers H04R23/00) > Gramophone pick-ups using a stylus; Recorders using a stylus

No child classifications to compare. This is a leaf node in both IPC and CPC.