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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
H04R 19/08

comprising two or more styli or transducers (H04R19/10 takes precedence)

Full Title

Electrostatic transducers > Gramophone pick-ups using a stylus; Recorders using a stylus (H04R19/01 takes precedence) > comprising two or more styli or transducers (H04R19/10 takes precedence)