Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 47B9 found under Holder Microphone by Seaview Electric Co. The National Stock Number assigned to this part is 5965002969994, 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 47B9.