Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ET600015A-20E-26B found under Generator Time Code by Symmetricom Inc. The National Stock Number assigned to this part is 6645015206562, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ET600015A-20E-26B.