Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WW21447 found under Blade Windshield Wiper by Emerson Electric Co. The National Stock Number assigned to this part is 1680002253711, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like WW21447.