TREA

with more than one granular chamber

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Industry

  • CPC
  • H04R21/023
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Parent Industries

HELECTRICITY H04Electric communication H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS H04R21/00Variable-resistance transducers

Current Industry

H04R21/023with more than one granular chamber
Industries