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Oscilloscope I-245, having a 5-inch cathode-ray tube, permits the viewing of wave forms and checking of frequencies and phase relations at various test points in radio and radar sets.
- TM 11-2689 Oscilloscope I-245-B. War Dept. Apr. 1945. 52 p. U408.3.A13 TM 11-2689 Apr. 1945