Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GS56778 found under Transformer Power by American Telephone And Telegraph Co. The National Stock Number assigned to this part is 5950008216806, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like GS56778.