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electron tubes 3 atomic and molecular physics 2 mathematical statistics 2
optical devices and systems 2 production engineering 2 Science & Technology - Other Topics 1
biochemistry & molecular biology; chemistry 1 coating materials 1 coatings and finishes 1
computer software, data handling and applications 1 electricity: basic concepts and phenomena 1 extraterrestrial physics and stellar phenomena 1
magnetism: basic concepts and phenomena 1 space flight 1 space physics 1
temperature measuring instruments 1

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