Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9D31-A found under Duplicating Machine Stencil Proc by Bell And Howell Inc. The National Stock Number assigned to this part is 3610010522298, and the Federal Supply Class is 3610 Printing Duplicating And Bookbinding Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9D31-A.