Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 439522241 found under Drafting Machine And Drawing Boa by Koh I Noor Rapidograph Inc. The National Stock Number assigned to this part is 6675012470356, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 439522241.