Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4400684-00 found under Controller Card Rea by Second Source Computers Inc. The National Stock Number assigned to this part is 7040012531712, and the Federal Supply Class is 7040 Punched Card Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4400684-00.