Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50B1900 found under Attenuator Assembly by Olympus Ndt Ne Inc. The National Stock Number assigned to this part is 5985010093836, and the Federal Supply Class is 5985 Antennas Waveguides And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 50B1900.