9027101000 under HS Code Others, 8525801900 under HS Code Others, and 8530800000 under HS Code ELECTRICAL SIGNALLING, SAFETY OR TRAFFIC CONTROL EQUIPMENT FOR RAILWAYS, TRAMWAYS, ROADS, INLAND WATERWAYS, PARKING FACILITIES, PORT INSTALLATIONS OR AIRFIELDS (OTHER THAN THOSE OF HEADING 8608) - OTHER EQUIPMENT were the top imported HS Codes by A ST LLC in 2021.