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Pneumatics
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-- See Also the narrower term Aerodynamics
--subdivision Aerodynamics under individual land vehicles and types of land vehicles, e.g. Automobiles--Aerodynamics
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-- See Also Gases
--specific gases, e.g. Acetylene; Helium; Hydrogen; Nitrogen; Oxygen
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-- See Also the narrower term Sound
--subdivision Acoustic properties under individual chemicals and groups of chemicals and individual materials and types of materials, e.g. Copper--Acoustic properties; Metals--Acoustic properties
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