Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4220ISPR found under Converter Frequency Electronic by B And B Electronics Mfg Co. The National Stock Number assigned to this part is 6130015317164, and the Federal Supply Class is 6130 Converters Electrical Non Rotating. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4220ISPR.