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Electric machinery --- Electrical engineering --- 621.38 --- Electric engineering --- Engineering --- Electromechanical devices --- Machinery --- Electronic devices. Electron tubes. Photocells. Particle accelerators. X-ray tubes --- 621.38 Electronic devices. Electron tubes. Photocells. Particle accelerators. X-ray tubes
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Electric machinery --- Electric engineering --- Engineering --- Electromechanical devices --- Machinery
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