Reference beam

https://www.wikidata.org/wiki/Q7307113

Field Hierarchy

Parent
Physics 31.7M papers	Engineering 23.9M papers	Quantum mechanics 13.1M papers	Optics 7.9M papers
Structural engineering 2.5M papers	Astronomy 2.5M papers	Civil engineering 813k papers	Beam (structure) 447k papers
Interferometry 142k papers		Holography 71.7k papers
Current
Reference beam 1,989 papers
Child

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History