Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9121-1 found under Gyroscope Rate by Mid Continent Instrument Co Inc. The National Stock Number assigned to this part is 6615013547527, and the Federal Supply Class is 6615 Automatic Pilot Mechanisms And Airborne Gyro Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9121-1.