Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QQ 73 found under Phase Shifter Electronic by Aeroflex Kdi Inc. The National Stock Number assigned to this part is 5915012800820, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like QQ 73.