Spark chamber

https://www.wikidata.org/wiki/Q1474375

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Physics 33.6M papers	Chemistry 29.4M papers	Engineering 25.6M papers	Organic chemistry 13.1M papers
Mechanical engineering 5.6M papers	Thermodynamics 5.2M papers	Physical chemistry 3.1M papers	Aerospace engineering 2.3M papers
Automotive engineering 917k papers		Combustion 391k papers
Current
Spark chamber 1,235 papers
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