Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21-193324-01 found under Window Observation by Polaroid Corporation. The National Stock Number assigned to this part is 9330004550564, and the Federal Supply Class is 9330 Plastics Fabricated Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21-193324-01.