Northrop Grumman Sperry Marine Type 5016 STO 074880 Gyro Compass 0098-14 | eBay
Hemisphere & Stem of a Hemispherical Resonator Gyroscope -- donated to the museum @ which this Is displayed by Northrop-Grumman. It might not look like very much; but apparently these hemispherical resonator
Northrop Grumman's Hemispherical Resonator Gyro Achieves 50 Million Operating Hours in Space | Northrop Grumman