Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R00428 found under Battery Box Upper C by Sonetics Corporation. The National Stock Number assigned to this part is 5965014669373, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R00428.