TREA

Variable-resistance transducers

Follow

Industry

  • CPC
  • H04R21/00
This industry / category may be too specific. Please go to a parent level for more data

Parent Industries

HELECTRICITY H04Electric communication H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS

Current Industry

H04R21/00Variable-resistance transducers

Sub Industries

H04R21/02Microphones H04R21/021with granular resistance material H04R21/023with more than one granular chamber H04R21/025disposition of the granular chamber in microphones H04R21/026in which the sound is perpendicular to the current crossing the transducer material H04R21/028with a fluid as resistance material H04R21/04Gramophone pick-ups using a stylus Recorders using a stylus
Industries