Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CSR-2003 64 found under Memory Portable Solid State by Calculex Inc. The National Stock Number assigned to this part is 7050015959086, and the Federal Supply Class is 7050 Adp Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CSR-2003 64.