Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GR3770 found under Copying Machine Indirect Electro by Risoinc. The National Stock Number assigned to this part is 3610014621299, 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 GR3770.