CIRCULATOR AND ISOLATOR. THESE CONSIST OF COLD ROLLED STEEL STAMPED HOUSINGS. INSERTED INTO THE HOUSINGS ARE VARIOUS METAL STAMPINGS, COPPER CIRCUITS, FERRITE PUCKS AND MAGNETS. THE DEVICES ARE FINISHED WITH A STEEL COVER AND LABEL. THEIR MAIN USE IS AT THE OUTPUT OF POWER AMPLIFIERS. RADIO FREQUENCY SIGNAL ISOLATOR FOR FREQUENCIES OF 890 MHz OR MORE BUT NOT EXCEEDING 1990 MHz, HAVING AN INSERTION LOSS NOT EXCEEDING 0.7 dB CONTAINED IN A HOUSING.

GIR'S 1 & 6 TEXT OF CN HEADING 8529 10 85 55