Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21B1117PTISSUEA found under Coil Radio Frequenc by I T I Electronics Inc. The National Stock Number assigned to this part is 5950006452889, 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 21B1117PTISSUEA.