Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 757B50 found under Attenuator Fixed by L3 Communications Corp. The National Stock Number assigned to this part is 5985000758391, 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 757B50.