Ring laser gyroscope system for a satellite associated with the NASA Goddard Space Weather Research Center, measuring 15″ x 10.75″ x 9″, with a Honeywell label on the side: "Dynamic Ref Unit, HG9083G2, Serial No. 342, Contr No. NAS5-31118." The system contains three ring laser gyroscopes and the electronics to operate the gyros and process the signals that came from them.
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