Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 66E3 found under Electronic Components Assembly by American Telephone And Telegraph Co. The National Stock Number assigned to this part is 5998007274127, and the Federal Supply Class is 5998 Electrical And Electronic Assemblies Boards Cards And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 66E3.