Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS691E-2 found under Delay Line by M E Systems Of Texas Inc. The National Stock Number assigned to this part is 5999010484586, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MS691E-2.