Labels:autoradiograph | cube | door | refrigerator OCR: Signal B1 Signal B2 Signal 83 IRE 3x 25 S units 100 sin 50 CCITT- 930 Half f-amplitude Time f rise Time of rise: approx 125 ns duration 250 ns approx 125 FIGURE A-4/N.73 Signal B for 525-line circuits 18930
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