Description:
The following taken from a metal plaque found with the instrument but does not belong to it. "Rectifier Power Unit, Serial #876, Type CMV-20269, Supply: 24VDC; A unit of Model SD-13 RAdar Equipment, Manufactured for Navy Department-Bureau of Ships by Harvey Wells Communications Inc. Contractor Raytheon Manf. Co., Waltham, MA Contract NXsr-97699"