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vacuum tube▼◼◼◼noun[UK: ˈvæ.kjʊəm tjuːb] [US: ˈvæ.kjuːm ˈtuːb]
vacuum valve▼noun[UK: ˈvæ.kjʊəm vælv] [US: ˈvæ.kjuːm ˈvælv]
klystron [klystrons]▼noun[UK: ˈklɪ.strɒn] [US: ˈklɪ.strɒn]
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