Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 221470-B21 found under Control Computer by Compaq Computer Corp. The National Stock Number assigned to this part is 7035015492183, and the Federal Supply Class is 7035 Adp Support Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 221470-B21.