Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R91-147 found under Coupler Directional by Microwave Engineering Corporation. The National Stock Number assigned to this part is 5985010843107, and the Federal Supply Class is 5985 Antennas Waveguides And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R91-147.