Optical communications repeater

https://www.wikidata.org/wiki/Q3935725

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Computer science 62.5M papers	Physics 33.4M papers	Chemistry 29.3M papers	Engineering 25.4M papers
Materials science 18.8M papers	Quantum mechanics 13.5M papers	Organic chemistry 13M papers	Composite material 8.8M papers
Optics 8.2M papers		Electrical engineering 4.9M papers
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Optical communications repeater 1,121 papers
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