TREA

using ionised gas

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Industry

  • CPC
  • H04R23/004
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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 H04R23/00Transducers other than those covered by groups H04R9/00 - H04R21/00

Current Industry

H04R23/004using ionised gas
Industries