8540890000 under HS Code THERMIONIC, COLD CATHODE OR PHOTO-CATHODE VALVES AND TUBES (FOR EXAMPLE, VACUUM OR VAPOUR OR GAS FILLED VALVES AND TUBES, MERCURY ARC RECTIFYING VALVES AND TUBES, CATHODE-RAY TUBES, TELEVISION CAMERA TUBES) - OTHER VALVES AND TUBES: OTHER, 9032890000 under HS Code Others, and 8517620009 under HS Code Others were the top imported HS Codes by A TEK RGSP LLC in 2021.