Vacuum tube

https://www.wikidata.org/wiki/Q3574371

Field Hierarchy

Parent
Chemistry 28.9M papers	Engineering 25M papers	Materials science 18.5M papers	Composite material 8.7M papers
Electrical engineering 4.8M papers		Physical chemistry 3M papers
Current
Vacuum tube 2,607 papers
Child
Tube tester 0 papers

Trends

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History