H04R21/021 - CPC Classification Index

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Classification
H04R
H04R21/00
H04R21/02
H04R21/021

ClassID:

232041 ⎘

H04R21/021 - CPC Classification

Classification description:

Variable-resistance transducers; Microphones with granular resistance material

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Classification
H04R
H04R21/00
H04R21/02
H04R21/021

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