Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1491-300-IT59 found under Amplifier Data Acquisition Syste by Duren Controls Inc. The National Stock Number assigned to this part is 5996015778354, 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 1491-300-IT59.