This page displays all 「FI」 in main group H04R21/00. HB:Handbook CC:Concordance ReturnTo FI-Section/Broad-Facet-Choice Onelevelup H04R21/00 Variable-resistance transducers (gaseous-resistance transducers H04R 23/00; magneto-resistive transducers H04R 23/00) HB CC 5D021 H04R21/02 .Microphones HB CC 5D021 H04R21/04 .Gramophone pick-ups using a stylus; Recorders using a stylus HB CC 5D125 TOP
H04R21/00 Variable-resistance transducers (gaseous-resistance transducers H04R 23/00; magneto-resistive transducers H04R 23/00) HB CC 5D021 H04R21/02 .Microphones HB CC 5D021 H04R21/04 .Gramophone pick-ups using a stylus; Recorders using a stylus HB CC 5D125