Part Number: RCA11 (Directional gyroscope)Part Number: RCA11A (Directional gyroscope)Part Number: RCA11A-11 (Directional gyroscope)Part Number: RCA11A-9 (Directional gyroscope)Part Number: RCA12F65 (Directional gyroscope)Part Number: SP-7576 (Directional gyroscope)Part Number: SP-7577 (Directional gyroscope)