Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ATD502-4 found under Cable Assembly Radio Frequency by Columbia Research Laboratories Inc. The National Stock Number assigned to this part is 5995001071647, and the Federal Supply Class is 5995 Cable Cord And Wire Assemblies Communication Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ATD502-4.