Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FR20-1666-01 found under Filter Band Suppression by Daden Anthony Associates Inc. The National Stock Number assigned to this part is 5915011969615, 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 FR20-1666-01.